Samacheer Kalvi Class 12 Bio Botany Solutions Chapter 4 Principles and Processes of Biotechnology

I. Choose the Correct Answer From the Given Option:

 

Question 1. Restriction enzymes are.
(a) Not always required in genetic engineering
(b) Essential tools in genetic engineering.
(c) Nucleases that cleave DNA at specific sites,
(d) Both (b) and (c).
Answer: (d) Both (b) and (c)
In simple words: Restriction enzymes are crucial for genetic engineering as they act like molecular scissors, cutting DNA at specific, recognizable sequences. This precise cutting is essential for manipulating genes.

🎯 Exam Tip: Remember that restriction enzymes are highly specific, recognizing and cutting DNA only at particular palindromic sequences. This specificity is key to their function in genetic engineering.

 

Question 2. Plasmids are
(a) circular protein molecules
(b) required by bacteria.
(c) tiny bacteria.
(d) Confer resistance to antibiotics.
Answer: (d) Confer resistance to antibiotics
In simple words: Plasmids are small, circular pieces of DNA found in bacteria that often carry genes which help the bacteria resist antibiotics. This ability is very useful for scientists in genetic engineering.

🎯 Exam Tip: Plasmids are important vectors in biotechnology because they can carry new genes, like antibiotic resistance genes, into other cells, allowing scientists to select for transformed cells.

 

Question 3. EcoRI cleaves DNA at.
(a) AGGGTT
(b) GTATATC.
(c) GAATTC
(d) TATAGC.
Answer: (c) GAATTC
In simple words: EcoRI is a specific restriction enzyme that cuts DNA only when it finds the base sequence GAATTC. This sequence is a palindrome, meaning it reads the same forwards and backwards on opposite strands.

🎯 Exam Tip: Memorize the common restriction enzymes and their specific recognition sites, especially for frequently asked examples like EcoRI, as this is a fundamental concept in molecular biology.

 

Question 4. Genetic engineering is
(a) making artificial genes
(b) hybridization of DNA of one organism to that of the others
(c) production of alcohol by using microorganisms
(d) making artificial limbs, diagnostic instruments such as ECG, EEC, etc.,
Answer: (b) Hybridization of DNA of one organism to that of the others
In simple words: Genetic engineering involves taking DNA from one living thing and combining it with DNA from another. This process changes the genetic makeup of an organism to give it new traits.

🎯 Exam Tip: Genetic engineering fundamentally deals with altering an organism's genes by introducing foreign DNA, aiming to create organisms with improved or desired characteristics.

 

Question 5. Consider the following statements:
I) Recombinant DNA technology, popularly known as genetic engineering, is a stream of biotechnology which deals with manipulation of genetic materials by man in vitro.
II) pBR322 is the first artificial cloning vector developed in 1977 by Boliver and Rodriguez from E.coli plasmid.
III) Restriction enzymes belong to a class of enzymes called nucleases.
Choose the correct option regarding the above statements:
(a) I & II.
(b) I & III.
(c) II & III
(d) I, II, & III
Answer: (d) I, II & III
In simple words: All three statements are correct. Genetic engineering is indeed about changing genetic material in a lab, pBR322 was the first human-made cloning tool, and restriction enzymes are a type of nuclease that cuts DNA. Together, these facts highlight key aspects of biotechnology.

🎯 Exam Tip: When evaluating multiple statements, break down each one to confirm its accuracy. This question covers basic definitions, historical facts, and classifications of tools in genetic engineering.

 

Question 6. The process of recombinant DNA technology has the following steps
I) Amplification of the gene
II) Insertion of recombinant DNA into host cells
III) Cutting of DNA at specific location using restriction enzyme
IV) Isolation of genetic material(DNA)
Choose the correct sequence of steps for recombinant DNA technology:
(a) II, III, IV, I
(b) IV, II, III, I
(c) I, II, III, IV
(d) IV, III, I, II
Answer: (d) IV, III, I, II
In simple words: First, DNA is taken out of cells (isolation). Then, it's cut into pieces (cutting) using special enzymes. Next, many copies of the desired gene are made (amplification). Finally, this changed DNA is put into new cells (insertion).

🎯 Exam Tip: Understanding the correct sequence of steps in recombinant DNA technology is crucial for designing and troubleshooting experiments. Visualizing each step helps in remembering the order.

 

Question 7. Which one of the following palindromic base sequence in DNA can be easily cut about the middle by some particular restriction enzymes?
(a) 5' CGTTCG 3' 3' ATCGTA 5!
(b) 5' GATATG3' 3' CTACТА 5'
(c) 5' GAATTC 3' 3' CTTAAG 5'
(d) 5' CACGTA 3' 3' CTCAGT 5'
Answer: (c) 5' GAATTC 3' 3' CTTAAG 5'
In simple words: A palindromic sequence reads the same forward on one strand and backward on the complementary strand. For example, if you read GAATTC on one strand from 5' to 3', its complementary strand reads CTTAAG from 3' to 5', which is the reverse of GAATTC. This mirror-like quality makes it a palindrome suitable for restriction enzyme cutting.

🎯 Exam Tip: To identify a palindromic sequence in DNA, read one strand in the 5' to 3' direction, and then read the complementary strand in the same 5' to 3' direction. If they are identical, it's a palindrome.

 

Question 8. pBR 322, BR stands for
(a) Plasmid Bacterial Recombination
(b) Plasmid Bacterial Replication
(c) Plasmid Boliver and Rodriguez
(d) Plasmid Baltimore and Rodriguez
Answer: (c) Plasmid Boliver and Rodriguez
In simple words: The "BR" in pBR322 comes from the names of the two scientists, Boliver and Rodriguez, who first created this important cloning plasmid. This naming convention is common in scientific discoveries.

🎯 Exam Tip: Remembering the full names associated with common laboratory tools like pBR322 can help you score extra points in general knowledge or historical context questions.

 

Question 9. Which one is used as a Biosensors?
(a) Electrophoresis
(b) Bioreactors
(c) Vectors
(d) Electroporation
Answer: (d) Electroporation
In simple words: Electroporation is a method that uses electricity to create tiny, temporary holes in cell membranes. This helps scientists insert DNA or other molecules into cells, which is part of how biosensors can be made or used.

🎯 Exam Tip: Biosensors detect substances by converting a biological response into an electrical signal. Electroporation is a technique used in creating biosensors or in processes related to them, by making cells more permeable.

 

Question 10. Match the following

(A) 1-a, 2-b, 3-c, 4-d
(B) 1-c, 2-d, 3-a, 4-b
(C) 1-a, 2-c, 3-b, 4-d
(D) 1-c, 2-d, 3-a, 4-a
Answer: (B) 1-c, 2-d, 3-a, 4-b
In simple words: Exonucleases cut DNA from the ends, endonucleases cut within the DNA chain, alkaline phosphatase helps remove phosphate groups, and ligase joins DNA fragments together. These enzymes each play a distinct role in DNA manipulation.

🎯 Exam Tip: Understand the specific function of each enzyme (exonuclease, endonuclease, ligase, phosphatase) in molecular biology, as they are fundamental tools in genetic engineering and often appear in matching questions.

 

Question 11. Ethidium Bromide is used?
(a) Southern Blotting Techniques
(b) Western Blotting Techniques.
(c) Polymerase Chain Reaction.
(d) Agarose Gel Electrophoresis.
Answer: (d) Agarose Gel Electrophoresis
In simple words: Ethidium bromide is a special dye that makes DNA visible under UV light. It is commonly used in agarose gel electrophoresis to see the separated DNA bands.

🎯 Exam Tip: Ethidium bromide is a fluorescent dye that binds to DNA and RNA, making them visible. Remember its specific application in gel electrophoresis for visualizing nucleic acids.

 

Question. Assertion : Agrobacterium tumefaciens is popular in genetic engineering because this bacterium is associated with the root nodules of all cereals and pulse crops. Reason: A gene incorporated in the bacterial chromosomal genome gets automatically transferred to the cross with which bacterium is associated.
(a) Both assertion and reason are true. But reason is correct explanation of assertion.
(b) Both assertion and reason are true. But reason is not correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
(e) Both assertion and reason are false.
Answer: (e) Both assertion and reason are false
In simple words: Both the assertion and the reason are incorrect. Agrobacterium tumefaciens forms tumors, not root nodules, and the gene transfer is from its plasmid, not its chromosomal genome, into plant cells.

🎯 Exam Tip: For assertion-reason questions, analyze each statement independently first to determine its truthfulness, then evaluate if the reason correctly explains the assertion. Agrobacterium tumefaciens is known for T-DNA transfer, not root nodule formation.

 

Question 13. Which one of the following is not correct statement.
(a) Ti plasmid causes the bunchy top disease.
(b) Multiple cloning site is known as Polylinker.
(c) Non viral method transfection of Nucleic acid in cell
(d) kind of biodegradable and bioactive thermoplastic
Answer: (a) Ti plasmid causes the bunchy top disease
In simple words: The Ti plasmid is known to cause crown gall disease in plants, not bunchy top disease. Bunchy top is usually caused by viruses. This makes option (a) the incorrect statement.

🎯 Exam Tip: Be precise with the diseases caused by different genetic elements. The Ti plasmid from Agrobacterium tumefaciens is specifically responsible for crown gall disease.

 

Question 14. An analysis of chromosomal DNA using the southern hybridisation technique does not use
(a) Electrophoresis.
(b) Blotting
(c) Autoradiography
(d) Polymerase Chain Reaction
Answer: (d) Polymerase Chain Reaction
In simple words: Southern hybridization is a method to find specific DNA sequences. It involves separating DNA using electrophoresis, transferring it to a membrane (blotting), and then detecting it with radioactive probes (autoradiography). Polymerase Chain Reaction (PCR) is a different technique used to make many copies of DNA, not typically a step within Southern hybridization itself.

🎯 Exam Tip: Southern hybridization is a classic technique for detecting specific DNA sequences in a sample. PCR is used for amplifying DNA, a distinct process though often used in conjunction with other molecular biology methods.

 

Question 15. An antibiotic gene in a vector usually helps in the selection of.
(a) Competent cells.
(b) Transformed cells
(c) Recombinant cells
(d) None of the options
Answer: (b) Transformed cells
In simple words: When a gene for antibiotic resistance is added to a vector, it acts as a marker. If a cell successfully takes up this vector, it becomes "transformed" and can survive in the presence of that antibiotic, allowing scientists to easily pick out the cells that have received the new DNA.

🎯 Exam Tip: Selectable markers like antibiotic resistance genes are essential in cloning to identify cells that have successfully taken up the vector (transformed cells) from those that have not.

 

Question 16. Some of the characteristics of Bt cotton are
(a) Long fibre and resistant to aphids
(b) Medium yield, long fibre and resistant to beetle pests
(c) High yield and production of toxic protein crystals which kill dipteran pests
(d) High yield and resistance to bollworms
Answer: (d) High yield and resistance to bollworms
In simple words: Bt cotton is genetically modified to produce a protein from Bacillus thuringiensis that is harmful to certain insect pests, especially bollworms. This helps the cotton plants grow better, leading to higher yields because they are protected from pest damage.

🎯 Exam Tip: Bt cotton's key advantage is its built-in resistance to bollworms, a major pest, which significantly reduces the need for chemical pesticides and often results in better crop yields.

 

Question 17. How do you use biotechnology in modern practice?
Answer: Today, biotechnology is a very big global industry, using biological tools to improve many products. Some key applications include:

• Pharmaceutical companies: They use biotechnology to create new medicines, vaccines, and diagnostic tests.
• Breweries: Biotechnology helps in fermentation processes for making alcoholic beverages like beer.
• Agro Industries & others: It is used to develop pest-resistant crops and improve food production.
• Modern biotechnology: This covers various methods, including recombinant DNA technology (rDNA), cell fusion, and tissue culture, to develop new products and processes.
• Major focus of Biotechnology: Biotechnology is used in areas like fermentation, biomass production, enzyme creation, biofuel development, microbial inoculants, plant and animal cell culture, rDNA technology, and process engineering for environmental solutions.

The table below shows a summary of various biotechnology applications:

In simple words: Biotechnology is used a lot today in many industries like making medicines, brewing drinks, and improving farming. It helps us create better products and find solutions in areas like health and the environment. For example, it helps make new drugs and clean up polluted water.

🎯 Exam Tip: When listing applications of biotechnology, try to provide diverse examples from different fields like medicine, agriculture, and environmental science to show a broad understanding.

 

Question 18. What are the materials used to grow microorganisms like Spirulina?
Answer: Spirulina can be grown easily using various readily available materials. These include wastewater from potato processing plants (which contains starch), straw, molasses, animal manure, and even sewage. These materials provide the nutrients needed to produce large amounts of Spirulina efficiently. Spirulina is a type of blue-green algae known for its high protein content and nutritional value.
In simple words: Spirulina can be grown using simple things like wastewater from potato factories, straw, molasses, animal waste, and sewage. These materials give it the food it needs to grow a lot.

🎯 Exam Tip: Emphasize that Spirulina can be cultivated using readily available, often waste, materials, highlighting its potential for sustainable food production and waste recycling.

 

Question 19. You are working in a biotechnology lab with a bacterium namely E.Coli. How will you cut the nucleotide sequence? Explain it.
Answer: When working in a biotechnology lab with E.coli to cut nucleotide sequences, restriction enzymes are used. Here's how it works:

• The exact way a restriction enzyme cuts DNA is very important for designing a gene cloning experiment.
• Some restriction enzymes cut both strands of the DNA right in the middle, creating "blunt" or "flush" ends. These are called symmetric cuts.
• Other restriction enzymes cut the DNA strands unevenly, a little off-center from the palindromic sites. This leaves single-stranded overhangs, known as "sticky" or "cohesive" ends. These sticky ends are very useful because they can easily join with other DNA fragments that have complementary sticky ends.

It is very important that both the vector DNA (the carrier) and the source DNA (the gene you want to add) are cut with the same restriction enzyme. This ensures that both pieces of DNA have matching sticky ends, which allows DNA ligase to easily join them together. Restriction enzymes are crucial tools in creating recombinant DNA.

In simple words: To cut DNA, you use special enzymes called restriction enzymes. Some cut evenly to make "blunt ends," while others cut unevenly to make "sticky ends." Sticky ends are better because they can easily stick to other matching DNA pieces, helped by another enzyme called DNA ligase, to make new combined DNA.

🎯 Exam Tip: Always specify the type of cut (blunt or sticky) made by restriction enzymes and explain why sticky ends are generally preferred for creating recombinant DNA, emphasizing the role of complementary base pairing and DNA ligase.

 

Question 20. What are the enzymes you can used to cut terminal end and internal phosphodiester bond of nucleotide sequence?.
Answer: To cut DNA at its ends or within its structure, specific enzymes are used:

• Restriction exonucleases: These enzymes are used to cut nucleotides one by one from the very ends (terminal ends) of a DNA molecule.
• Restriction endonucleases: In contrast, these enzymes cut the internal phosphodiester bonds within a DNA molecule. They specifically recognize and cleave DNA at particular sequences within the strand, not just from the ends.

Both types of enzymes are vital for manipulating DNA in biotechnology, allowing for precise cuts at desired locations. The difference lies in where they start cutting the DNA molecule.
In simple words: To cut DNA, we use two main types of enzymes: exonucleases, which cut from the ends of the DNA, and endonucleases, which cut inside the DNA strands. Each has a special job in breaking the bonds that hold DNA together.

🎯 Exam Tip: Clearly distinguish between exonucleases (cut from ends) and endonucleases (cut internally) and remember that restriction endonucleases are the "molecular scissors" of genetic engineering for precise internal cuts.

 

Question 21. Name the chemicals used in gene transfer.
Answer: Gene transfer can be achieved using certain chemicals that help DNA enter host plant cells without a vector. This is known as chemical-mediated gene transfer.

• Poly Ethylene Glycol (PEG): This chemical helps plant protoplasts (cells without cell walls) to take up DNA. PEG creates temporary pores in the cell membrane, allowing the DNA to pass through.
• Dextran Sulphate: Similar to PEG, dextran sulphate also helps to induce the uptake of DNA into plant protoplasts.

These chemicals help cells become more permeable to foreign DNA, which is essential for introducing new genes into plants. This method avoids the need for biological vectors like Agrobacterium.
In simple words: To move genes into plant cells, chemicals like Poly Ethylene Glycol (PEG) and Dextran Sulphate are used. They help the plant cells absorb new DNA without needing a special carrier.

🎯 Exam Tip: When asked about chemical methods of gene transfer, always mention PEG and Dextran Sulphate and explain their role in making plant cells permeable to DNA for successful uptake.

 

Question 22. What do you know about the word pBR322?
Answer: pBR322 is a very important and widely used cloning vector in biotechnology. It is a reconstructed plasmid with several key features:

• Base pairs: It contains 4361 base pairs, which is a specific length for this plasmid.
• "P" denotes Plasmid: The 'p' in pBR322 stands for plasmid, indicating its nature as a circular DNA molecule.
• "B&R" from Boliver and Rodriguez: The 'BR' part comes from the names of the two scientists, Boliver and Rodriguez, who developed this plasmid.
• "322" is the lab number: The number '322' signifies that it was the 322nd plasmid developed in their laboratory.
• Antibiotic resistance genes: It contains two different antibiotic resistance genes: \( \text{amp}^R \) (ampicillin resistance) and \( \text{tet}^R \) (tetracycline resistance). These genes are important for selecting cells that have taken up the plasmid.
• Recognition sites: It has several recognition sites for different restriction enzymes (like HindIII, EcoRI, Bam HI, SalI, PvuII, PstI, ClaI), allowing scientists to insert foreign DNA at specific points.
• Ori and Rop: It includes an 'ori' (origin of replication) sequence, which allows the plasmid to replicate independently within the host cell. The 'rop' gene codes for proteins involved in the replication of the plasmid.

Overall, pBR322 is a versatile and well-characterized vector, making it a cornerstone for many genetic engineering experiments.

In simple words: pBR322 is a well-known, man-made DNA circle (plasmid) used in science to copy genes. It has special names from its creators (Boliver and Rodriguez), a lab number (322), genes that resist two types of antibiotics (ampicillin and tetracycline), and specific spots where other DNA can be cut and inserted. It also has a starting point for copying itself.

🎯 Exam Tip: When describing pBR322, ensure you explain what each part of its name (p, BR, 322) signifies, its key features like antibiotic resistance genes, origin of replication (ori), and restriction sites, and its role as a cloning vector.

 

Question 23. Mention the application of Biotechnology.
Answer: Biotechnology is a very important and growing science in the 21st century, with wide applications across many sectors, benefiting human beings significantly.

Biotechnology is used to produce secondary metabolites, biofertilizers, biopesticides, enzymes, biomass energy, biofuel, and in bioremediation for environmental phytoremediation. It also covers aspects like rDNA technology and process engineering, which involves treating effluent and recycling water.
In simple words: Biotechnology has many uses, like making new medicines (vaccines, antibiotics), creating stronger plants that resist diseases and pests (Bt-Cotton, Goldenrice), and helping clean up the environment. It's also used to make biofuels and in food industries.

🎯 Exam Tip: When detailing applications, categorize them (e.g., Agriculture, Medicine, Environment) and provide specific examples for each. For instance, mention Bt cotton for agriculture and insulin for medicine.

 

Question 24. What is the restriction enzymes? Mention their type with a role in Biotechnology.
Answer: Restriction enzymes are special enzymes that come from bacteria. They work by cutting DNA at or near very specific recognition sites found within DNA molecules. This ability to make precise cuts in DNA is a fundamental principle used in biotechnology. It allows scientists to cut DNA, insert a desired gene (also called a gene of interest), and create recombinant DNA (rDNA) with new, desired characteristics.
There are three main classes of restriction endonucleases:

• Type I, II & III: These types differ slightly in how they work and where they cut DNA.
• Type II Restriction Enzymes: These are preferred in recombinant DNA technology. They cut DNA within a specific sequence that is usually 4 to 8 base pairs long. Examples include HindII, EcoRI, PvuI, Bam HI, and TaqI.
• Hind II: This enzyme cuts DNA at a specific sequence made of 6 base pairs, which is its recognition sequence.

Over 900 different restriction enzymes have been found, isolated from more than 230 types of bacteria. Each enzyme has its own unique DNA recognition sequence.
Restriction endonucleases are named systematically:

• The first letter comes from the genus of the bacterium.
• The next two letters come from the species of the bacterium.
• Then, the strain of the organism is included.
• Finally, a Roman numeral indicates the order in which the enzyme was discovered.

For example, EcoRI is from *Escherichia* (E) *coli* (co) strain Ry 13 (R), and it was the first endonuclease (I) discovered from that strain. These enzymes often recognize palindromic sequences, meaning the DNA reads the same on both strands in opposite directions.
In simple words: Restriction enzymes are like tiny scissors from bacteria that cut DNA at special spots. They are used in biotechnology to cut DNA so new genes can be added, creating changed DNA. There are different types, but Type II is used most often. They are named after the bacteria they come from.

🎯 Exam Tip: When defining restriction enzymes, mention their bacterial origin, specificity (recognition sites), and role in cutting DNA. For types, focus on Type II and provide an example like EcoRI, explaining its naming convention and palindromic recognition site.

 

Question 25. Are there any possibilities to transfer a suitable desirable gene to host plant without vector? Justify your answer.
Answer: Yes, it is possible to transfer a desired gene into a host plant without using a biological vector. Several direct methods are available for this:

• a. Chemical mediated gene transfer: Chemicals like Poly Ethylene Glycol (PEG) and Dextran Sulphate can make plant protoplasts (cells without walls) take up DNA. These chemicals temporarily make the cell membrane porous.
• b. Microinjection: In this method, a very fine glass needle is used to directly inject DNA into the nucleus of a cell. The plant protoplasts are held still on a solid support, like an agarose slide, while the DNA is injected.
• c. Electroporation method of gene transfer: Plant protoplasts, cells, or tissues are exposed to short, high-voltage electrical pulses. This creates temporary pores in the plasma membrane, allowing foreign DNA to enter the cell.

• d. Liposome-mediated methods of gene transfer: In this method, the gene or DNA is enclosed within artificial lipid vesicles called liposomes. These liposomes can then fuse with the plant cell membrane, delivering the DNA into the cell.
• e. Biolistics (Gene Gun): This technique uses a "gene gun" or "microprojectile gun" to bombard target tissues with tiny gold or tungsten particles that are coated with DNA. The high-speed particles penetrate the cell walls and membranes, delivering the DNA directly into the cells. The bombarded cells or tissues are then cultured to grow into transformed plants.

These direct methods offer alternative ways to introduce foreign genes into plants, bypassing the need for natural vectors like bacteria or viruses.
In simple words: Yes, genes can be put into plants without using natural carriers. This can be done by using chemicals to open cell membranes, injecting DNA directly with tiny needles, using electricity to create holes in cells (electroporation), wrapping DNA in fat bubbles (liposomes), or shooting DNA-coated particles into cells with a special gun (biolistics). Each way helps the plant take in the new gene.

🎯 Exam Tip: When explaining vector-less gene transfer, list at least three distinct methods (e.g., microinjection, electroporation, biolistics) and briefly describe the mechanism of each. Visual aids like diagrams for electroporation can enhance your answer.

 

Question 26. How will you identify vectors?
Answer: Vectors have specific properties that make them useful in genetic engineering, such as being able to create many copies and having sites for DNA insertion. They are also easy to get into host cells.

In simple words: Vectors are like tiny delivery vehicles that carry new DNA into cells. They are small, can make many copies, and have special places where DNA can be added or detected.

🎯 Exam Tip: When describing vectors, always mention their key features like origin of replication (ori), selectable markers, and multiple cloning sites (MCS).

 

Question 27. Compare the various types of Blotting techniques.
Answer: Blotting techniques are used to transfer biological molecules from a gel to a membrane for further analysis. They help scientists study DNA, RNA, and proteins in different ways. The three main types are Southern, Northern, and Western blotting, each designed for a specific molecule.

In simple words: Southern blotting looks at DNA, Northern blotting looks at RNA, and Western blotting looks at proteins. They all involve moving these molecules from a gel onto a special paper to study them.

🎯 Exam Tip: Remember the mnemonic "SNW" for Southern, Northern, Western, and "DRP" for DNA, RNA, Protein, respectively, to easily recall which blotting technique targets which molecule.

 

Question 28. Write the advantages of herbicide-tolerant crops.
Answer: Herbicide-tolerant crops are genetically engineered to withstand herbicides, which helps farmers manage weeds more easily. This technology makes farming more efficient and less harmful to the environment in certain aspects.

In simple words: These crops can survive weed killers, so farmers can spray less and still get good harvests. This helps control weeds, saves money, and makes the soil healthier.

🎯 Exam Tip: Focus on how herbicide tolerance leads to better weed management, reduced chemical use, and improved crop yield for full marks.

 

Question 29. Write the advantages and disadvantages of Bt cotton.
Answer: Bt cotton is a genetically modified crop designed to produce a toxin that kills common pests like bollworms, reducing the need for chemical pesticides. However, it also comes with certain drawbacks that farmers need to consider.

In simple words: Bt cotton helps farmers grow more cotton by killing pests naturally, so they use less bug spray. But the seeds are expensive, and the pest protection doesn't last very long. It also might not work against all types of pests and could harm helpful insects.

🎯 Exam Tip: When discussing GM crops, always provide a balanced view, detailing both the benefits (e.g., pest resistance, reduced pesticide use) and the drawbacks (e.g., cost, limited effectiveness, impact on other organisms).

 

Question 30. What is bioremediation? Give some examples of bioremediation.
Answer: Bioremediation is a method that uses living organisms, like microorganisms or plants, to clean up pollution in the environment. It is a natural and often cost-effective way to treat various types of waste by breaking down harmful substances into less toxic forms. This approach is used for things like oil spills, industrial waste, and solid waste. It works by changing pollutants into harmless products, helping to restore contaminated areas.
The bioremediation process can be applied to remove oil, petrochemical residues, pesticides, or heavy metals from soil or groundwater. It is often less expensive and more environmentally friendly than other cleaning methods.
Strategies for bioremediation in soil and water include:

• Using natural microbial populations that are already present to break down pollutants.
• Adding specially adapted or designed microbial cultures to boost the cleanup process.
• Using plants, which is known as green technology, to absorb or break down contaminants.

In simple words: Bioremediation uses tiny living things or plants to clean up dirt and pollution. It helps make polluted places like soil or water clean again by getting rid of harmful chemicals.

🎯 Exam Tip: Define bioremediation clearly, mention the types of organisms used (microbes, plants), and provide examples of pollutants it can clean up (oil, heavy metals) for a complete answer.

 

Question 31. Write the benefits and risks of Genetically Modified Foods.
Answer: Genetically Modified (GM) foods offer several benefits, such as increased yield and pest resistance, which can help feed a growing population. However, there are also potential risks and concerns related to health and environmental impacts that need to be carefully considered. It's important to weigh these pros and cons when evaluating GM foods.

In simple words: GM foods can grow more and resist bugs, meaning less pesticides are needed. But some people worry they might cause health problems or affect how our bodies work, and that their seeds might not be reusable.

🎯 Exam Tip: For questions about GM foods, always present both the advantages (e.g., improved yield, pest resistance, nutritional value) and the disadvantages (e.g., health concerns, environmental impact, ethical issues) for a balanced answer.

12th Bio Botany Guide Principles And Processes Of Biotechnology Additional Important Questions And Answers

 

Question 1. Which one of the following is a secondary metabolite? IWriiWJ
(a) Ethanol
(b) Acetic acid
(c) Citric acid
(d) Toxic pigments
Answer: (d) Toxic pigments
In simple words: Secondary metabolites are special compounds made by plants and other organisms that are not directly needed for growth but help with survival, like toxic pigments which can deter predators.

🎯 Exam Tip: Identify secondary metabolites as compounds not essential for basic metabolism but important for defense, signaling, or other specialized functions.

 

Question 2. Bio-Technology was coined by.
(a) Weisner
(b) Karl Prantl
(c) Sanger & Gilbert
(d) Karl Ereky
Answer: (d) Karl Ereky
In simple words: The term "biotechnology" was first used by Karl Ereky, who defined it as using living things to make products.

🎯 Exam Tip: When asked about historical figures in science, remember the names associated with key discoveries or the coining of important terms.

 

Question 3. Traditional Bio-Technology is also known as.
(a) Fermentation Biology
(b) Kitchen Technology
(c) Hybridization Biology
(d) Transgenic Biology
Answer: (b) Kitchen Technology
In simple words: Older forms of biotechnology, like making bread or cheese, are sometimes called "Kitchen Technology" because they were done at home using simple methods.

🎯 Exam Tip: Understand that biotechnology has ancient roots, with traditional methods like fermentation often being referred to informally as "kitchen technology."

 

Question 4. Genetic engineering is
(a) making artificial genes
(b) hybridization of DNA of one organism to that of the others
(c) production of alcohol by using micro organisms
(d) making artificial limbs, diagnostic instruments such as ECG, EEC, etc.,
Answer: (b) hybridization of DNA of one organism to that of the others
In simple words: Genetic engineering means mixing DNA from different living things to create new genetic combinations. This allows for new traits or products.

🎯 Exam Tip: Genetic engineering involves altering an organism's DNA, often by combining DNA from different sources, leading to recombinant DNA technology.

 

Question 5. Which of the following can be Bio Technological products?
(a) Antibiotics
(b) Vaccines
(c) Enzymes
(d) All the above.
Answer: (d) All the above.
In simple words: Biotechnology helps make many useful things like medicines (antibiotics, vaccines) and special proteins (enzymes) that are used in various industries.

🎯 Exam Tip: Remember that biotechnology produces a wide range of products, including pharmaceuticals, industrial enzymes, and agricultural solutions.

 

Question 6. Multiplication of Alien DNA in organisms required
(a) ROP
(b) ORI
(c) Stop codon
(d) TATA box
Answer: (b) ORI
In simple words: For foreign DNA to make copies inside a cell, it needs a special starting point called ORI. This is where the copying process begins.

🎯 Exam Tip: The 'ori' (origin of replication) is crucial for a plasmid or foreign DNA to multiply within a host cell, ensuring that many copies of the desired gene are made.

 

Question 7. Tools of Biotechnology is used for effluent treatment, water cycling is known as
(a) Process Engineering
(b) Production Engineering
(c) Mechanical Engineering
(d) Microbial Engineering
Answer: (a) Process Engineering
In simple words: Using biotechnology tools to treat wastewater and manage water recycling is part of process engineering. It focuses on using biological systems for industrial processes.

🎯 Exam Tip: Process engineering in biotechnology often involves optimizing large-scale biological systems for applications like waste treatment and resource recovery.

 

Question 8. The scientist who use a first viral vaccine to inoculate a child from smallpox is
(a) Louis Pasteur
(b) Edward Jenner
(c) Sanger and Gilbert.
(d) Arber and Nathans
Answer: (b) Edward Jenner
In simple words: Edward Jenner was the first scientist to successfully use a vaccine against smallpox, a deadly disease, by using a milder virus.

🎯 Exam Tip: Edward Jenner is known as the father of immunology for his pioneering work on the smallpox vaccine, which laid the foundation for modern vaccination.

 

Question 9. The enzyme used for making artificial sweeteners is
(a) Lactose
(b) Galactose
(c) Invertase
(d) Reductase
Answer: (c) Invertase
In simple words: Invertase is an enzyme that helps break down sugar into simpler sugars, which is used to make artificial sweeteners for food and drinks.

🎯 Exam Tip: Invertase is an enzyme often used in the food industry to produce invert sugar from sucrose, impacting the sweetness and texture of products.

 

Question 10. Development of Artificial gene functioning within living cells was done by
(a) H.G.Khorana
(b) Ian Wilmet
(c) G. Edwards
Answer: (a) H.G.Khorana
In simple words: H.G. Khorana was a scientist who helped discover how genetic information is coded, which led to the creation of artificial genes that work inside living cells.

🎯 Exam Tip: Har Gobind Khorana's work on synthetic DNA and the genetic code was pivotal in advancing molecular biology and genetic engineering.

 

Question 11. rDNA is also known as
(a) Hybrid DNA-RNA
(b) Recombinant of vector DNA and desired genes
(c) Chimeric DNA
(d) Both b & c
Answer: (d) Both b & c
In simple words: rDNA, or recombinant DNA, is created when DNA from different sources is joined together, like combining a vector's DNA with a desired gene. This mixed DNA is also called chimeric DNA.

🎯 Exam Tip: Recombinant DNA (rDNA) is a key concept in genetic engineering, representing DNA molecules formed by combining genetic material from different organisms.

 

Question 12. Plasmids are
(a) ss DNA
(b) ds DNA(linear)
(c) rDNA
(d) Vector DNA
Answer: (d) Vector DNA
In simple words: Plasmids are small, circular pieces of DNA found in bacteria that can carry new genes. Because they can carry genetic material, they are often used as vectors in genetic engineering.

🎯 Exam Tip: Plasmids are extra-chromosomal DNA in bacteria that serve as common vectors for gene cloning and transfer due to their ability to replicate independently.

 

Question 13. pBR322 is most extensively studied
(a) Foreign gene
(b) r DNA
(c) done
(d) Plasmid DNA of Ecoli.
Answer: (d) Plasmid DNA of Ecoli.
In simple words: pBR322 is a well-known type of plasmid from E.coli bacteria. Scientists use it a lot in labs because it's a good tool for cloning genes.

🎯 Exam Tip: pBR322 is a common cloning vector in genetic engineering, known for its small size and well-defined restriction sites, making it easy to manipulate.

 

Question 14. Restriction enzymes recognize specific
(a) Palindromic region,
(b) Exons
(c) Introns
(d) None of these
Answer: (a) Palindromic region
In simple words: Restriction enzymes are like molecular scissors that cut DNA at very specific spots. These spots are usually palindromic, meaning they read the same forwards and backwards on opposite strands of DNA.

🎯 Exam Tip: Understand that restriction enzymes identify and cut at palindromic sequences, which are crucial for creating compatible sticky ends in recombinant DNA technology.

 

Question 15. Restriction enzymes of Ecoli are
(a) Hind III
(b) Bam III
(c) EcoRI I & EcoRI II
(d) All of these.
Answer: (c) EcoRI I & EcoRI II
In simple words: E. coli bacteria make specific restriction enzymes called EcoRI I and EcoRI II. These enzymes are used to cut DNA at certain points.

🎯 Exam Tip: EcoRI is a widely used restriction enzyme, derived from E. coli, known for recognizing the specific palindromic sequence GAATTC.

 

Question 16. The best cloning organism for biotechnology is
(a) Agrobacterium
(b) Pseudomonas
(c) Lambda phage
(d) E. Coli
Answer: (d) E. Coli
In simple words: E. Coli is a common bacteria that scientists use a lot in biotechnology. It's easy to grow and work with, making it a great choice for cloning genes.

🎯 Exam Tip: E. coli is preferred for many cloning experiments due to its rapid growth, well-understood genetics, and ease of genetic manipulation.

 

Question 17. The ability to form tumours is found in the plasmids of
(a) E.coli
(b) Pseudomonas
(c) Agrobacterium tumefaciens
(d) Pneumococcus
Answer: (c) Agrobacterium tumefaciens
In simple words: Agrobacterium tumefaciens is a type of bacteria that has plasmids with the ability to cause tumors in plants. This natural ability has been modified and used in genetic engineering.

🎯 Exam Tip: Agrobacterium tumefaciens, with its Ti plasmid, is a natural genetic engineer often used to transfer desired genes into plants due to its tumor-inducing property.

 

Question 18. Engineered bacterium carries
(a) Plasmids
(b) rDNA
(c) c DNA
(d) ssDNA
Answer: (b) rDNA
In simple words: When bacteria are engineered, they usually carry recombinant DNA (rDNA). This rDNA is made by combining DNA from different sources to give the bacteria new functions.

🎯 Exam Tip: Engineered bacteria are typically modified to contain recombinant DNA, which includes foreign genes, allowing them to produce desired proteins or traits.

 

Question 19. Electrophoresis and southern blotting techniques are used in
(a) DNA fingerprinting
(b) Gene Synthesis
(c) gene cloning
(d) All of these.
Answer: (a) DNA fingerprinting
In simple words: Electrophoresis and Southern blotting are scientific methods used to look at DNA. They help create a unique DNA pattern, which is useful for things like identifying people or solving crimes, similar to fingerprints.

🎯 Exam Tip: DNA fingerprinting relies on techniques like gel electrophoresis to separate DNA fragments by size and Southern blotting to visualize specific DNA sequences, creating a unique profile.

 

Question 20. In biosensors Green Fluorescent protein is used which is isolated from A and
(a) A Chlamydomonas – B Ecoli
(b) A Gelidium – B Bacillus subtilis
(c) A Aequorea victoria – B Arabidopsis thaliana
(d) A Asoaragus – B Accacia melanoxylon
Answer: (c) A Aequorea victoria – B Arabidopsis thaliana
In simple words: Green Fluorescent Protein (GFP) is a bright protein found in a type of jellyfish, Aequorea victoria. It is often used in biosensors as a marker to show when certain biological processes are happening.

🎯 Exam Tip: Green Fluorescent Protein (GFP) is a valuable tool in biotechnology, commonly used as a reporter gene in biosensors due to its natural fluorescence, making processes visible.

 

Question 21. Bacteria protects themselves from viral attack by producing
(a) Exonuclease
(b) Endonuclease
(c) DNAligase
(d) Gy ase
Answer: (b) Endonuclease
In simple words: Bacteria have a defense system against viruses. They make special enzymes called endonucleases that cut up the virus's DNA, stopping the infection.

🎯 Exam Tip: Endonucleases are a class of restriction enzymes that cleave phosphodiester bonds within a polynucleotide chain, used by bacteria as a defense mechanism against foreign DNA.

 

Question 22. Molecular scissor is
(a) Urease
(b) Helicase
(c) Peptidase
(d) Restriction Endonuclease
Answer: (d) Restriction Endonuclease
In simple words: Restriction endonucleases are often called "molecular scissors" because they cut DNA at specific points. This ability is very important in genetic engineering.

🎯 Exam Tip: The term "molecular scissors" specifically refers to restriction enzymes, especially endonucleases, due to their precise DNA-cutting capability, which is fundamental to genetic engineering.

 

Question 23. Which one of the following is used in transfer of foreign DNA to crop plants?
(a) Penicillum Expansum
(b) Agrobacterium tumefaciens
(c) Meloidogyne Incognita
Answer: (d) Agrobacterium tumefaciens
In simple words: Agrobacterium tumefaciens is a bacterium that naturally transfers its DNA into plant cells. Scientists use this natural ability to put new, desired DNA into crop plants.

🎯 Exam Tip: Agrobacterium tumefaciens is a key tool in plant genetic engineering, leveraging its natural mechanism of T-DNA transfer to introduce foreign genes into plant genomes.

 

Question 24. E coli is the mostly used organism for gene cloning, because
(a) It is easy to handle
(b) It is growing easily under optimal condition
(c) It is the safe organism
(d) All the above.
Answer: (d) All the above.
In simple words: E. coli is a popular choice for gene cloning because it's simple to handle in the lab, grows quickly, and is generally safe to work with.

🎯 Exam Tip: E. coli is a model organism in molecular biology due to its fast growth rate, simple nutritional requirements, and well-characterized genetic system, making it ideal for genetic manipulation.

 

Question 25. Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular restriction enzyme?
(a) 5' CGTTCG 3' 3' ATGGTA 5'
(b) 5' GATATG 3' 3' CTACТА 5'
(c) 5' GAATTC 3' 3' CTTAAG 5'
(d) 5' CACGTA 3' 3' CTCAGT 5'
Answer: (c) 5' GAATTC 3' 3' CTTAAG 5'
In simple words: A palindromic sequence reads the same forward on one DNA strand and backward on the other, like "GAATTC". Restriction enzymes specifically recognize and cut these types of symmetrical sequences.

🎯 Exam Tip: Palindromic sequences are critical in genetic engineering as they are the recognition sites for restriction enzymes, allowing precise DNA cutting and rejoining.

 

Question 26. Biolistics (gene gun) is suitable for
(a) Constructing recombinant DNA by joining with vectors
(b) DNA finger printing
(c) Disease resistant genes
(d) Transformation of plant cells
Answer: (d) Transformation of plant cells
In simple words: Biolistics, also known as the gene gun method, shoots tiny particles coated with DNA into cells. This method is especially good for putting new DNA into plant cells.

🎯 Exam Tip: Biolistics is a direct gene transfer method primarily used for plant cells, where DNA-coated microprojectiles are shot into the cells to introduce new genetic material.

 

Question 27. For transformation micro particles coated with DNA to be bombarded with gene gun are made up of
(a) Silver or Platinum
(b) Platinum or Zinc
(c) Silicon or Platinum
(d) Gold or Tungsten
Answer: (d) Gold or Tungsten
In simple words: In the gene gun method, tiny particles that carry the DNA into cells are made from heavy metals like gold or tungsten. These metals are good for this job because they are dense and inert.

🎯 Exam Tip: Gold and tungsten are used for microprojectile bombardment in biolistics because they are biologically inert and dense enough to penetrate cell walls efficiently.

 

Question 28. Rising of dough is due to
(a) Multiplication of Yeast
(b) Production of CO2
(c) Emulsification
(d) Hydrolysis of wheat flour starch in to sugar
Answer: (b) Production of CO2
In simple words: When yeast is added to dough, it eats the sugar and makes carbon dioxide gas. This gas gets trapped in the dough, causing it to puff up and rise.

🎯 Exam Tip: The leavening effect in dough is primarily due to the carbon dioxide gas produced by yeast during fermentation, which creates air pockets and causes the dough to expand.

 

Question 30. For making GMO, the three basic steps that are required are
(a) Identification of DNA with desirable gene
(b) Introduction of identified DNA into the host
(c) Maintenance of introduced DNA in to the host and transfer of DNS to its progeny
(d) All of the options
Answer: (d) All of the options
In simple words: To create a Genetically Modified Organism, you first find the gene you want, then put it into the new host, and finally make sure the host keeps the gene and passes it on. All these steps are necessary.

🎯 Exam Tip: Remember the three core steps for GMO creation: identifying the gene, introducing it, and maintaining its presence through generations.

 

Question 31. Zymology is the study of
(a) Fermentation & its practical use
(b) Name of Bioreactors
(c) Upstream pro^ss
(d) Downstream process
Answer: (a) Fermentation & its practical use
In simple words: Zymology is the study of fermentation, which is how certain living things break down sugar for energy, and also how we use this process in real life, for example, to make bread or alcohol.

🎯 Exam Tip: Understand that zymology covers both the biological process of fermentation and its many practical applications in industries like food and beverage.

 

Question 32. ECORI – R stands for
(a) Genus
(b) Species
(c) Strains
(d) Group
Answer: (a) Genus
In simple words: When we name restriction enzymes like EcoRI, the 'R' tells us the genus of the bacterium it came from. This helps us identify its origin.

🎯 Exam Tip: Familiarize yourself with the naming conventions of common restriction enzymes, especially how each part (Eco, R, I) indicates its origin.

 

Question 33. Which is suitable for transferring an alien DNA into a plant cell?
(a) CaCl2
(b) Biolistics or gene gun method
(c) Micro infection
(d) Heat shock
Answer: (b) Biolistics or gene gun method
In simple words: To put new DNA into a plant cell, a special "gene gun" method called biolistics is often used. It shoots tiny particles coated with DNA into the plant cells.

🎯 Exam Tip: Remember biolistics (gene gun) as a key method for introducing DNA into plant cells, often preferred for its effectiveness in bypassing the cell wall.

 

Question 34. The group of degradable biopolymers are
(a) CrylAc and DMH-11
(b) PHAs and PHB
(c) GFP and PGA
(d) DMH and HT
Answer: (b) PHAs and PHB
In simple words: PHAs and PHB are types of plastics made by living things that can break down naturally in the environment. They are called degradable biopolymers.

🎯 Exam Tip: Distinguish between different types of biopolymers and recall examples of those that are naturally degradable, such as PHAs and PHB, due to their importance in sustainable technology.

 

Question 35. Genetically engineered human insulin is
(a) Haematiri
(b) Pro insulin
(c) Hybridin
(d) Humulin
Answer: (d) Humulin
In simple words: The man-made version of human insulin, created using genetic engineering, is known as Humulin. It helps people with diabetes manage their blood sugar.

🎯 Exam Tip: Note "Humulin" as the specific name for genetically engineered human insulin, a significant breakthrough in biotechnology and medicine.

 

Question 36. Which of the following can be Live microbial food supplements
(a) Food Allergens
(b) safe antibiotics
(c) Carcinogenic microbes
(d) Live microbial food supplements
Answer: (d) Live microbial food supplements
In simple words: Live microbial food supplements are good bacteria or yeasts that you can eat to help your digestion and overall health. They are often called probiotics.

🎯 Exam Tip: Understand that live microbial food supplements (probiotics) contain beneficial microorganisms that support gut health and are different from allergens or harmful microbes.

 

Question 37. Bt Brinjal is produced by using A and is having resistance against B.
(a) A Ecoli - B Virus
(b) A Virus - B Bacteria
(c) A Agrobacterium – B Bacillus
(d) A Agrobacterium – B Lepidopteron
Answer: (d) A Agrobacterium - B Lepidopteron
In simple words: Bt Brinjal is made by using a bacteria called Agrobacterium to insert genes that make the brinjal plant resistant to certain insect pests, specifically from the Lepidopteron group like fruit and shoot borers.

🎯 Exam Tip: Remember that Bt Brinjal uses genes from Bacillus thuringiensis, often delivered via Agrobacterium, to provide resistance against lepidopteran pests, which are common crop destroyers.

 

Question 38. PCR refers to
(a) A common laboratory technique of making millions of copies of a particular region of DNA
(b) A biotechnological procedure of replicating DNA strands
(c) Hybridization of DNA molecules in to several fragments
(d) It is a test for tracing genetic defects.
Answer: (a) A common laboratory technique of making millions of copies of a particular region of DNA
In simple words: PCR is a widely used lab method that can quickly make many, many copies of a specific piece of DNA. This helps scientists study even tiny amounts of DNA.

🎯 Exam Tip: Recall that PCR (Polymerase Chain Reaction) is essential for amplifying DNA, making it crucial for genetic testing, forensics, and research.

 

Question 40. The characteristics of molecular probe are
(a) I. a & b
(b) II. b & c
(c) III. a & d
(d) IV. c & d
Answer: (d) IV. c & d
In simple words: A molecular probe is a special tool used in science that is made of either DNA or RNA and can stick to a matching part of a gene. This allows scientists to find specific genes.

🎯 Exam Tip: For molecular probes, remember they are single-stranded nucleic acids (DNA or RNA) and their ability to bind specifically to complementary sequences is their key characteristic.

 

Question 41. Use of biology in industrial process and for improving quality of life is called
(a) Biotechnology
(b) Genetic engineering
(c) Eugenics
(d) Microbiology
Answer: (a) Biotechnology
In simple words: When we use knowledge about living things and biological processes to make products or improve life, for example, in medicine or farming, it is called biotechnology.

🎯 Exam Tip: Biotechnology is a broad field encompassing various applications, including genetic engineering and microbiology, all aimed at improving human life and industrial processes.

 

Question 42. Somoclonal variations occur in plants subjected to
(a) r DNA technology
(b) Exposed to gamma rays
(c) Tissue culture
(d) Highly polluted environmrnt
Answer: (c) Tissue culture
In simple words: Somaclonal variations are unexpected changes that happen in plants when they are grown in a lab using tissue culture methods. These changes are not caused by normal genetic mixing.

🎯 Exam Tip: Recognize that somaclonal variations are an important consideration in plant tissue culture, as they can lead to both desirable and undesirable traits.

 

Question 68. Assertion : Stirred tank fermenters help in obtaining the foreign gene product Reason: They allow the large scale growth of the biomass that leads to a higher yield of desired proteins
Answer: (a) If both 'A' and 'R' are true and 'R' is the correct explanation of A
In simple words: Stirred tank fermenters are good because they help grow a lot of the desired product. This is because they allow a large amount of biomass to grow, which gives more of what we need.

🎯 Exam Tip: When evaluating Assertion-Reason questions, first check if both statements are true individually, then assess if the Reason logically explains the Assertion.

 

Question 69. Assertion: PCR is used in rDNA technology. Reason: Special fast multiplying vectors are produced using PCR method.
Answer: (b) It both 'A' and 'R' are true but 'R' is not the correct explanation of A
In simple words: Both statements are true. PCR is indeed used in rDNA technology, and it helps make many copies of DNA. However, PCR itself doesn't make 'vectors'; it just copies the DNA pieces.

🎯 Exam Tip: Remember that PCR amplifies DNA fragments, while vectors are separate carriers for gene transfer. Don't confuse their roles.

 

Question 70. Assertion : In EcoRI, the letter R is derived from the genus of bacteria. Reason: EcoRI, the name of palindromic nucleotide sequences.
Answer: (d) If both A & R are false
In simple words: Both statements are false. The 'R' in EcoRI actually comes from the strain of the bacterium, not the genus. Also, EcoRI refers to the enzyme itself, not the palindromic sequences it cuts.

🎯 Exam Tip: Familiarize yourself with the naming convention of restriction enzymes, as it helps identify their origin and function.

 

Question 71. Assertion : Assertion:Micro injection technique is used to inject rDNA directly into the nucleus of an animal cell Reason: Genegun is used to transfer rDNA into plant cells
Answer: (b) It both 'A' and 'R' are true but 'R' is not the correct explanation of A
In simple words: Both assertion and reason are true facts. Microinjection puts rDNA into animal cell nuclei, and a gene gun puts rDNA into plant cells. However, the reason for using a gene gun in plants does not explain why microinjection is used in animal cells.

🎯 Exam Tip: Distinguish between different gene transfer methods based on the type of cell (plant or animal) they are typically used for.

 

Question 72. Assertion : In Dio reactors, the transforming cells are maintained in their physiologically most active phase. Reason: A large biomass using higher yields of desired protein is got by it.
Answer: (a) If both 'A' and 'R' are true and 'R' is the correct explanation of A
In simple words: Both statements are true, and the reason explains the assertion. Bioreactors keep cells very active. This helps them grow a lot, which means we get a high amount of the protein we want.

🎯 Exam Tip: Remember that bioreactors aim to optimize conditions for cell growth and product yield, ensuring cells are in their most productive phase.

 

Question 73. Assertion: n rDNA technology, the restriction enzymes, those produce sticky ends are commonly used. Reason: Sticky ends facilitates the action of enzyme DNA ligase.
Answer: (a) It both 'A' and 'R' are true and 'R' is the correct explanation of A
In simple words: Both statements are true and related. Restriction enzymes that create "sticky ends" are often used in rDNA technology. This is because these sticky ends make it easier for DNA ligase to join DNA fragments together, which is important for creating recombinant DNA.

🎯 Exam Tip: Understand that sticky ends are crucial for efficient ligation in genetic engineering because they allow complementary base pairing between DNA fragments.

 

Question 74. Assertion : Cloning vector should have selectable marker. Reason: Selectable marker helps in identifying and eliminating non – trnsformants and selectively permitting the growth of transformants.
Answer: (a) It both 'A' and 'R' are true and 'R' is the correct explanation of A
In simple words: Both parts are true, and the reason correctly explains why cloning vectors need selectable markers. A selectable marker helps scientists find which cells have taken up the new DNA and also prevents other cells from growing.

🎯 Exam Tip: Selectable markers are essential for distinguishing between cells that have successfully received the recombinant DNA and those that have not, simplifying the screening process.

III. Choose the correct statement

 

Question 75. The bio reactor is a Fermentor – vessel in which the following factors are controlled.
a. Nutrient, temperature and microorganism
b. Aeration, agitation, temperature and pH
c. Aeration, Activation, Agarose gel & hormones.
d. Hormones, Carbon Dioxide & not trade secrets.
Answer: (b) Aeration, agitation, temperature and pH
In simple words: A bioreactor is a special container where factors like air supply (aeration), mixing (agitation), warmth (temperature), and acidity (pH) are carefully managed. This helps tiny living things grow and make useful products.

🎯 Exam Tip: Recall that bioreactors provide a controlled environment to maximize microbial growth and product formation, making environmental factors like aeration, agitation, temperature, and pH critical.

 

Question 76. Which one of the following statement is true regarding IPR?
a. The discoverer has the full rights on his/her property.
b. IPR includes only the process of the product
c. IPR is not protected by laws framed by the country.
d. The discoverer can use his discovery for his own company but can not sell it to others.
Answer: (a) The discoverer has the full rights on his/her property.
In simple words: IPR, or Intellectual Property Rights, means that the person who invents something new has the complete legal right to their invention. They own it just like they would own physical property.

🎯 Exam Tip: Understand that IPR protects a discoverer's exclusive rights to their invention, preventing unauthorized use by others.

 

Question 77. Most of Bt toxins are insecticidal to the larvae of Honeybees, Butterflies & Lepidoptera.
a. Most of Bt toxins are insecticidal to the larvae of Honeybees, Butterflies & Lepidoptera.
b. Bt – Brinjal is developed to give resistant against viral attacks.
c. Flavr – Savr is a variety of corn produced by Agrobacterium mediated genetic engineering technique
d. Goldenrice has been genetically altered so that the endosperm now accumulates Beta – Carotene
Answer: (d) Goldenrice has been genetically altered so that the endosperm now accumulates Beta -Carotene
In simple words: Golden rice is a type of rice that has been changed to make beta-carotene, which the body turns into Vitamin A. This is done to help people who don't get enough Vitamin A in their diet.

🎯 Exam Tip: Golden rice is a key example of biofortification through genetic engineering, designed to address vitamin A deficiency in populations.

 

Question 78. Cosmids are hybrid vectors derived from plasmids.
a. Cosmids are hybrid vectors derived from plasmids.
b. YAC plasmid vector does not behave like a yeast chromosome.
c. BAC vector is not used in rDNA technology.
d. Plasmids are plasmids present in most of the Prokaryotes.
Answer: (a) Cosmids are hybrid vectors derived from plasmids.
In simple words: Cosmids are like special DNA carriers that combine parts of both plasmids and phage DNA. They are used to carry larger pieces of DNA in genetic engineering.

🎯 Exam Tip: Remember that cosmids are hybrid vectors designed for cloning larger DNA fragments, combining features of plasmids and bacteriophages.

IV. Choose the incorrect statements

 

Question 79. ELISA is a diagnostic tool in the identification of pathogen species by using antibodies
a. ELISA is a diagnostic tool in the identification of pathogen species by using antibodies
b. In plant pathology ELISA is used to weed out virus infected plants.
c. ELISA test is one of the tests in the diagnosis of AIDS.
d. The presence of Mycobacterium tuberculosis is also traced by ELISA test.
Answer: (d) The presence of Mycobacterium tuberculosis is also traced by ELISA test.
In simple words: The incorrect statement is that ELISA is used to detect Mycobacterium tuberculosis. While ELISA is a common diagnostic test that uses antibodies to find pathogens, it's not the primary method for tracing Mycobacterium tuberculosis, which typically uses different diagnostic approaches like bacterial culture or PCR.

🎯 Exam Tip: While ELISA is versatile, different pathogens require specific diagnostic techniques. Understand the specific applications of various diagnostic tests.

 

Question 80. DNA probes are used in the identification of viruses and other pathogen.
a. DNA probes are used in the identification of viruses and other pathogen.
b. RNA probes are used in the identification of bacteria as pathogens.
c. Northern Blotting can also be used in the identification of pathogenecity of viruses.
d. Southern Blotting help as a tool to identify virus and other pathogens.
Answer: (b) RNA probes are used in the identification of bacteria as pathogens
In simple words: The incorrect statement is that RNA probes are used to identify bacteria as pathogens. While DNA probes are commonly used for this, RNA probes are typically used for detecting RNA, not bacteria.

🎯 Exam Tip: Differentiate between DNA and RNA probes based on their target molecules (DNA or RNA) in various blotting techniques.

IV. Fill in the blanks Answer

 

Question 1. The method that involved the growth of tissues & cells in a suitable new om the parent plant is known as.......
Answer: Tissue culture
In simple words: Tissue culture is a way to grow new plants from a small piece of a parent plant in a controlled environment.

🎯 Exam Tip: Understand that tissue culture allows for the propagation of plants from small explants under sterile conditions.

 

Question 2. The range of insects killed by Bt. Toxins are....
Answer: Lepidopteron
In simple words: Bt toxins kill specific insects, mainly those in the Lepidoptera group, like moths and butterflies, helping to protect crops.

🎯 Exam Tip: Remember that Bt toxins are highly specific, targeting certain insect orders while being safe for most other organisms.

 

Question 3. The genes that code for Bt toxins are commercially called..
Answer: Cry genes
In simple words: The genes that make Bt toxins are known as Cry genes. These genes are put into plants to make them resistant to insects.

🎯 Exam Tip: "Cry genes" is a key term to remember in the context of Bt crops and insect resistance.

 

Question 4. The first company to produce insulin by rDNA technology is.
Answer: Eli Lilly
In simple words: Eli Lilly was the first company to make insulin using recombinant DNA technology, which was a big step in medicine.

🎯 Exam Tip: Note this historical milestone as an important application of recombinant DNA technology in medicine.

 

Question 5. The Indian scientist who was the innovator of ELISA in India is...
Answer: Usha M Joshi
In simple words: Usha M Joshi is known as the scientist who introduced and innovated the ELISA technique in India, which is used for many diagnostic tests.

🎯 Exam Tip: Knowing key figures in scientific innovations, especially in your region, can be useful for general knowledge questions.

 

Question 6. PCR is usually used to detect the..................... in a suspected .patient.
Answer: HIV & AIDS
In simple words: PCR, or Polymerase Chain Reaction, is often used to find out if a patient has HIV or AIDS by looking for the virus's genetic material.

🎯 Exam Tip: PCR is a highly sensitive method for detecting viral genetic material, making it effective for early diagnosis of infections like HIV.

 

Question 7. Are present in increased quantities in glutelin is....
Answer: rice
In simple words: Glutelin is a type of protein found in high amounts in rice. It is an important storage protein in rice grains.

🎯 Exam Tip: Be aware of the major storage proteins in common food crops, as they are significant for nutrition.

 

Question 8. Protein encoded by cry Ab control..
Answer: Cotton borer
In simple words: The protein made by the Cry Ab gene helps control the cotton borer insect, which damages cotton plants.

🎯 Exam Tip: Specifically linking Cry Ab to cotton borer shows detailed knowledge of Bt gene applications.

 

Question 9. Use of microorganism in solution to recover toxic metal pollutants from contaminated sites is.
Answer: Bioleaching
In simple words: Bioleaching is a process where tiny living things like bacteria are used to clean up polluted areas by taking out harmful metals from the soil or water.

🎯 Exam Tip: Bioleaching is a specific bioremediation technique for extracting metals using microorganisms, distinguishing it from other cleanup methods.

 

Question 10. The endosperm of normal rice doesnot contain..
Answer: Beta carotene
In simple words: Regular rice grains do not naturally have beta-carotene, which is a key ingredient for making Vitamin A in the body. That's why genetically modified 'Golden Rice' was created.

🎯 Exam Tip: This fact highlights the nutritional gap that golden rice aims to fill, making it an important point in biotechnology applications.

V. Two Marks

 

Question 1. What are the tools for genetic engineering?
Answer: The main tools used in genetic engineering are:

• Enzymes, specifically restriction endonucleases to cut DNA and DNA ligase to join it.
• Vectors, which are carriers like plasmids or viruses that carry the foreign DNA.
• Host organisms, typically bacteria or yeast, where the modified DNA is introduced and multiplied.

In simple words: Genetic engineering uses special enzymes to cut and glue DNA, vectors to carry the new DNA, and host cells to grow and use this modified DNA.

🎯 Exam Tip: List the three main categories of tools-enzymes, vectors, and host organisms-and provide a brief function for each to score full marks.

 

Question 2. What is PCR?
Answer: PCR, which stands for Polymerase Chain Reaction, is a common laboratory method. It is used to make many millions of copies of a specific part of DNA. This process is very important for many genetic studies and diagnostic tests.
In simple words: PCR is a lab method that makes many copies of a small piece of DNA very quickly.

🎯 Exam Tip: Define PCR by its full name and explain its core function of amplifying specific DNA regions, emphasizing "millions of copies."

 

Question 3. Differtiate between Exonuclease & Endonuclease
Answer: Exonucleases and endonucleases are two types of enzymes that cut DNA:
1. Exonucleases remove nucleotides one by one from the ends of a DNA molecule. They might also cut RNA. For example, Exonuclease.
2. Endonucleases break the internal phosphodiester bonds within a DNA molecule. They do not cut RNA. Examples include Hind II, EcoRI, PvuI, Bam HI, and Taq I. Endonucleases are crucial for gene editing as they create breaks within DNA strands, allowing new genetic material to be inserted.
In simple words: Exonucleases cut DNA from the ends, while endonucleases cut DNA from inside the strand.

🎯 Exam Tip: Clearly state the key difference: exonucleases act at the ends, and endonucleases act within the DNA strand. Give one example for each if possible.

 

Question 4. What is the role of Restriction endonuclease in the life of bacteria?
Answer: Restriction endonucleases play a vital defense role in bacteria. They are part of a system called the restriction-modification system. These enzymes help bacteria protect themselves by cutting the genetic material of invading viruses, making the viruses harmless. This is like the bacteria's immune system.
In simple words: Restriction enzymes help bacteria defend themselves from viruses by cutting up the virus's DNA.

🎯 Exam Tip: Emphasize their role in the restriction-modification system and their function as a bacterial defense mechanism against viral infections.

 

Question 5. How do DNA ligases join the DNA fragments?
Answer: DNA ligase is an enzyme that joins DNA fragments together. It does this by creating a phosphodiester bond between the sugar and phosphate parts of two DNA strands. This reaction needs energy, which comes from ATP (adenosine triphosphate). It essentially acts as a molecular glue, sealing gaps in the DNA backbone.
In simple words: DNA ligase acts like glue, connecting broken DNA pieces by joining their sugar and phosphate parts using energy from ATP.

🎯 Exam Tip: Focus on the key action: forming phosphodiester bonds between sugar and phosphate, and mention the ATP requirement.

 

Question 6. What do you know about the properties of vectors?
Answer: Vectors are essential tools in genetic engineering, acting as carriers for desired genes. Here are some of their key properties:

• Vectors can be cloning vectors (used to carry DNA into a host cell) or expression vectors (used to make a specific protein in a host cell).
• They must have an origin of replication (ori) so they can copy themselves inside the host cell.
• They should contain a selectable marker (like antibiotic resistance genes) to help identify cells that have taken up the vector.
• Vectors often have unique restriction sites (polylinkers) where foreign DNA can be inserted.

In simple words: Vectors are like special carriers for DNA in genetic engineering. They can copy themselves, help us find which cells have them, and have specific spots where new DNA can be added.

🎯 Exam Tip: When describing vector properties, always include origin of replication (ori), selectable marker, and restriction sites as these are fundamental to their function.

 

Question 7. What is meant by ori?
Answer: "Ori" stands for Origin of Replication. It is a special DNA sequence on a plasmid or vector where the process of DNA copying (replication) starts. When a piece of DNA is linked to this "ori" sequence, the entire unit can be copied many times within the host cells. This ensures that the inserted gene is multiplied.
In simple words: Ori is a special spot on DNA where copying starts, allowing the whole DNA piece to make many copies inside a cell.

🎯 Exam Tip: Clearly define "ori" as the "Origin of Replication" and explain its role in initiating DNA replication within host cells, which is crucial for gene cloning.

 

Question 8. What is the main function of a selectable marker?
Answer: The main function of a selectable marker in a vector is to help identify and select cells that have successfully taken up the recombinant DNA (transformants). It works by:

• Allowing the growth of transformed cells (those with the vector) under specific conditions, often by providing resistance to an antibiotic.
• Eliminating non-transformed cells (those without the vector), which cannot grow under these conditions.

This makes it much easier for scientists to isolate the cells that have the desired gene.
In simple words: A selectable marker helps scientists find cells that have taken in new DNA and stops other cells from growing.

🎯 Exam Tip: Emphasize the dual role of a selectable marker: identifying transformants and eliminating non-transformants, typically through antibiotic resistance.

 

Question 9. What is known as Walking genes or jumping genes or Transposons?
Answer: Walking genes, jumping genes, or transposons are DNA sequences that can move and insert themselves into different locations within a genome. They do this without needing any specific sequence relationship with the target area. This ability to move around the genome makes them unique and has implications for gene expression and evolution. They were first discovered by Barbara McClintock.
In simple words: Jumping genes, also called transposons, are DNA pieces that can move to new places in the cell's DNA.

🎯 Exam Tip: Highlight that transposons are mobile genetic elements capable of self-insertion into new genomic locations without sequence homology.

 

Question 10. Differentiate between BAG &Y AC vector
Answer: Here's a comparison between BAC (Bacterial Artificial Chromosome) and YAC (Yeast Artificial Chromosome) vectors:

In simple words: BAC vectors are like special plasmids used in bacteria that can carry medium-sized DNA. YAC vectors are like small, artificial chromosomes used in yeast that can carry very large pieces of DNA.

🎯 Exam Tip: Focus on the key differences: the host organism (bacteria vs. yeast) and the capacity for cloning large DNA inserts. This helps determine which vector is suitable for a given task.

 

Question 11. Differentiate between plasmid DNA & chromosomal DNA
Answer: Here's a comparison between Plasmid DNA and Chromosomal DNA:

In simple words: Plasmid DNA is small, circular DNA found outside the main chromosome, often carrying extra genes. Chromosomal DNA is the main, larger DNA that holds all the essential genetic information for an organism.

🎯 Exam Tip: Focus on differences in location, size, essentiality, and presence of histones and introns to effectively distinguish between plasmid and chromosomal DNA.

 

Question 12. Ecoli is the most widely used organism as genetic material in Biotechnological studies-justify
Answer: E.coli is widely used in biotechnology studies for several reasons:

• Its genetic makeup has been extensively studied and is well understood.
• It is easy to handle in the lab and grows very quickly.
• E.coli can accept a wide range of vectors, making it suitable for many genetic engineering tasks.
• It has also been thoroughly studied for safety, ensuring it is a reliable host organism.
• Under ideal conditions, E.coli cells can divide very rapidly, sometimes every 20 minutes, leading to fast production.

In simple words: E.coli is a popular choice in labs because it's well-understood, easy to grow quickly, can take in new DNA easily, and is known to be safe.

🎯 Exam Tip: When justifying E.coli's use, highlight its well-characterized genetics, rapid growth, ease of handling, and ability to accept vectors, as these are its key advantages.

 

Question 13. What is Biolistics method/ gene gun/ shot gun/method of DNA introduction ? Give any one practical application of this method of gene transfer
Answer: The Biolistics method, also known as gene gun or shotgun method, is a way to introduce DNA into cells. In this method, microscopic particles (usually gold or tungsten) are coated with DNA and then fired at high speed into target cells or tissues. This physical method allows DNA to penetrate the cell walls and membranes.
One practical application of this method is in inserting genes for pesticide or herbicide resistance into plant cells. For example, a gene conferring resistance to a common herbicide can be introduced into crop plants, making them tolerant to that herbicide.
In simple words: The gene gun shoots tiny DNA-coated particles into cells to add new genes. For example, it helps make plants resistant to pesticides.

🎯 Exam Tip: Define biolistics as a physical method of gene transfer using DNA-coated microprojectiles and provide a clear example of its application, such as herbicide resistance in plants.

 

Question 14. Biotechnologists refer to Agrobacterium tumifaciens as a natural genetic engineer of plants. Give reasons to support then statement
Answer: Biotechnologists call *Agrobacterium tumefaciens* a "natural genetic engineer" of plants because it has a unique natural ability to transfer its own DNA into plant cells. This bacterium contains a large Ti (Tumor inducing) plasmid. When *Agrobacterium* infects a plant at a wound site, a part of its Ti plasmid, called T-DNA, is naturally transferred and stably integrated into the plant's genome. This leads to the formation of tumors in the plant. Scientists have learned to remove the tumor-inducing genes from the T-DNA and replace them with desired genes, making *Agrobacterium* an effective natural vector for plant genetic engineering.
In simple words: *Agrobacterium tumefaciens* is called a natural genetic engineer because it can naturally put its own DNA into plant cells. Scientists use this ability to put useful genes into plants instead.

🎯 Exam Tip: Explain that *Agrobacterium tumefaciens* naturally transfers its T-DNA into plant cells, and biotechnologists exploit this mechanism by replacing the tumor-inducing genes with desired genes.

 

Question 15. What is 'Gene knock out' . Name the two types of vectors used for 'Gene knock out'
Answer: Gene knock-out is a genetic technique where a specific gene in an organism is inactivated or removed. This process targets the nuclei of cells to stop a particular gene from working. Scientists use gene knock-out to study the function of genes by observing the changes that happen when that gene is no longer active.
Two types of vectors commonly used for gene knock-out are:

• Insertion vectors: These insert new DNA into a gene, disrupting its function.
• Replacement vectors: These replace the target gene with a different sequence, often a non-functional one.

In simple words: Gene knock-out means turning off or removing a specific gene to see what happens. This is done using special insertion or replacement vectors that change the gene.

🎯 Exam Tip: Define gene knock-out as inactivating a gene to study its function, and remember the two main vector types: insertion and replacement, which achieve this by different mechanisms.

 

Question 16. What is Genome project?
Answer: A genome project is a large-scale scientific effort aimed at analyzing the complete genetic material (genome) of an organism. This involves sequencing all the DNA in the organism and then using sequence analysis and homology comparisons with other known genomes. For instance, genome projects have been undertaken for organisms like *Chlamydomonas* (algae), *Arabidopsis thaliana*, rice, and maize to understand their genetic makeup fully. The Human Genome Project is a famous example.
In simple words: A genome project is a big plan to map out all the genetic information of a living thing, like creating a complete instruction book for it.

🎯 Exam Tip: Define a genome project as the complete sequence analysis of an organism's genetic material, and mention a few examples to illustrate its scope.

 

Question 17. What is Biofortification?
Answer: Biofortification is a biotechnology process aimed at increasing the nutritional value of food crops. This is achieved by either conventional breeding methods or, more commonly, through gene transfer technology. For example, golden rice has been biofortified to contain vitamin A, helping to address nutritional deficiencies in populations. This process enriches crops with essential nutrients like proteins, carbohydrates, and vitamins.
In simple words: Biofortification is a way to make food crops more nutritious by adding more vitamins or minerals to them, often using genetic methods.

🎯 Exam Tip: Emphasize that biofortification enhances nutritional quality in crops, and use golden rice as a classic example for vitamin A enrichment.

 

Question 18. What are the advantages of Herbicide tolerant crops
Answer: Herbicide-tolerant crops offer several advantages:

• They improve weed control, which leads to higher crop yields.
• They reduce the amount of herbicides needed, making farming more eco-friendly and less hazardous.
• Using low-toxicity compounds means the herbicides don't stay active in the soil for long, reducing environmental harm.
• They reduce competition between the crop plants and weeds, ensuring healthy plant growth.
• This technology contributes to soil structure conservation and supports soil microbes by reducing the need for extensive tilling for weed control.

In simple words: Herbicide-tolerant crops help control weeds better, give more yield, use less harmful chemicals, and protect the soil.

🎯 Exam Tip: Highlight both agricultural benefits (yield, weed control) and environmental benefits (reduced chemical usage, soil health) when discussing herbicide-tolerant crops.

 

Question 19. How is the Bacillus thuringiensis bacterium protected from BT. toxin and how it is effective in insect body?
Answer: *Bacillus thuringiensis* (Bt) bacteria produce a protein toxin, but they are protected from it because the toxin exists in an inactive form called protoxin within the bacterium. This protoxin becomes active only when ingested by certain insects. Inside the insect's gut, the alkaline pH (high pH) activates the protoxin. Once active, the toxin binds to specific epithelial cells in the insect's midgut, creating pores. These pores cause the cells to swell and lyse (burst), leading to the death of the insect larva. The specific alkaline conditions in the insect gut are key to activating the toxin, thus protecting the bacterium itself.
In simple words: The Bt bacterium is safe from its own toxin because the toxin is inactive inside it. When an insect eats it, the toxin becomes active in the insect's alkaline gut, making holes in its stomach cells and killing it.

🎯 Exam Tip: Explain the two-part mechanism: the toxin's inactive form in the bacterium and its activation by alkaline pH in the insect gut, leading to cell lysis.

 

Question 20. Distinguish between cry & cry III Ab
Answer: Here's how to distinguish between "cry" (gene) and "Cry III Ab" (protein):

• "cry" refers to the gene that codes for the Bt toxin. These genes are written with lowercase letters (e.g., *cry*IAc).
• "Cry III Ab" refers to the specific protein that is produced by a *cry* gene. The protein symbol is always written with a capital first letter, followed by Roman numerals and letters, indicating the specific type of toxin (e.g., CryIAc).

So, "cry" is the instruction (gene), and "Cry III Ab" is the product (protein).
In simple words: "cry" is the gene's name, written in small letters, which contains the instructions. "Cry III Ab" is the name of the actual protein made from that gene, written with a big letter at the start.

🎯 Exam Tip: Remember the capitalization rule: lowercase for the gene (*cry*) and uppercase for the protein (Cry), along with their respective meanings (code vs. product).

 

Question 21. What is bio remediation?
Answer: Bioremediation is an approach that uses living organisms, such as genetically engineered microorganisms (GEMS) or green plants, to clean up environmental pollution. It is used to treat various types of waste, including non-biodegradable and toxic substances like oil, petrochemical residues, pesticides, and heavy metals. This process can be applied in different environments, such as soil, groundwater, and marine environments, to make them more sustainable and less contaminated. For instance, oil spills can be cleaned up using oil-eating bacteria.
In simple words: Bioremediation is using tiny living things or plants to clean up pollution like oil or heavy metals in nature.

🎯 Exam Tip: Define bioremediation as the use of biological agents (microbes or plants) to clean up pollutants, and give examples of contaminants it addresses.

 

Question 22. What are the limitations of Bioremediation?
Answer: Bioremediation, while effective, has certain limitations:

• It can only degrade biodegradable contaminants, meaning it's not suitable for all types of pollutants.
• The process must be specific to the contaminated site; what works in one place might not work in another due to different environmental conditions.
• Small-scale tests need to be conducted before applying it on a larger scale to ensure effectiveness.
• It can be a costly process and often requires more research in specific areas to optimize its application.

In simple words: Bioremediation only works for certain pollutants, needs specific conditions for each site, requires careful testing, and can be expensive with ongoing research needs.

🎯 Exam Tip: When listing limitations, focus on specificity (biodegradable, site-specific), scalability (small-scale tests), and resource requirements (cost, research).

 

Question 23. What is Algal bio-fuel-Explain
Answer: Algal biofuel is a type of fuel made from algae. It is seen as a good alternative to fossil fuels, fuels from corn, and sugarcane. Algae can be grown in areas unsuitable for traditional agriculture, such as marginal lands or even wastewater. This helps save land for food production. Algae are very efficient at converting sunlight and carbon dioxide into energy-rich compounds, making them a promising source for sustainable biofuel production. For example, *Botryococcus braunii* is an algae known for producing high amounts of hydrocarbons.
In simple words: Algal biofuel is fuel made from algae. It's a green choice because it doesn't use farming land and can grow in many places, helping us move away from fossil fuels.

🎯 Exam Tip: Explain algal biofuel as fuel from algae, emphasizing its sustainability, non-competition with food crops, and efficiency in converting sunlight to energy.

 

Question 24. Write the chemistry of biological hydrogen production by algae?
Answer: Algae can produce hydrogen gas through a process called photobiological water splitting. Normally, algae perform photosynthesis, but if certain conditions are altered, particularly if they are deprived of sulfur, their photosynthetic process shifts. This shift causes the algae to stop producing oxygen and instead produce hydrogen gas. Electrons involved in this process are transported to enzymes called [Fe]-hydrogenases, which then facilitate the production of hydrogen from water. This method offers a clean, alternative fuel source.
In simple words: Algae can make hydrogen gas, especially when they don't get enough sulfur. Instead of making oxygen like usual, they use water and special enzymes to create hydrogen as an energy source.

🎯 Exam Tip: Describe the process as photobiological water splitting, highlighting the role of sulfur deprivation and [Fe]-hydrogenase enzymes in shifting metabolism towards hydrogen production.

 

Question 25. Write the principle of electrophoresis?
Answer: Electrophoresis is a technique used to separate different biomolecules, such as DNA, RNA, or proteins, based on their charge and size. The principle is that when an electric current is applied, charged molecules will migrate through a gel matrix. Negatively charged molecules (anions) move towards the positive electrode (anode), while positively charged molecules (cations) move towards the negative electrode (cathode). Smaller molecules generally move faster through the gel than larger ones, allowing for separation by size as well. The varying electrical charges on different molecules cause them to move at different speeds.
In simple words: Electrophoresis separates molecules by using electricity. Charged molecules move through a gel, with smaller ones moving faster and different charges moving in different directions.

🎯 Exam Tip: Explain that electrophoresis separates molecules based on charge and size, under an electric field, with negatively charged molecules moving to the anode and smaller molecules moving faster.

 

Question 26. What is screening?
Answer: Screening is the process of finding and identifying specific cells that have successfully received the new recombinant DNA (r-DNA molecule) after it has been introduced. This is important because not all cells will take up the r-DNA. It helps to separate the altered cells from the unaltered ones.
In simple words: Screening means finding the cells that successfully got the new DNA.

🎯 Exam Tip: Screening is a crucial step in genetic engineering to ensure only the desired transformed cells are used for further processes.

 

Question 27. Name the two types of gene transfer methods in plants?
Answer: The two main types of gene transfer methods used in plants are direct gene transfer and indirect gene transfer. Direct transfer involves putting DNA directly into cells, while indirect transfer uses a carrier to deliver the DNA. Researchers often choose the method that works best for the specific plant and gene they are working with.
In simple words: Genes can be put into plants in two ways: directly or by using a helper (vector).

🎯 Exam Tip: Remember that direct methods don't use a biological helper, while indirect methods do, like with Agrobacterium.

 

Question 28. Define Zymology?
Answer: Zymology is the scientific study of fermentation and its practical uses. This field explores how microorganisms like yeast and bacteria break down substances to create products like alcohol and bread. It is a vital area of research, especially in industries that rely on microbial processes.
In simple words: Zymology is the study of fermentation and how it is used.

🎯 Exam Tip: Zymology covers both the biological process of fermentation and its industrial applications, like in brewing and baking.

VI. Three Marks.

 

Question 1. Give the two main features of modern biotechnology that differentiated it from conventional technology
Answer: Modern biotechnology differs from traditional methods in two key ways:
• Its ability to change genetic material directly to get new products through recombinant DNA technology. This allows for very specific changes.
• The ownership of these new technologies and their social impact are carefully considered. This includes thinking about patents and how they affect society.
In simple words: Modern biotechnology can change genes directly and also focuses on the ownership and social effects of new discoveries, unlike older methods.

🎯 Exam Tip: When differentiating, emphasize the precision of gene manipulation and the ethical/economic considerations as key modern aspects.

 

Question 2. What is a bioreactor?
Answer: A bioreactor is a special container or vessel designed to provide the perfect conditions for microorganisms or their enzymes to interact with a substance. This interaction helps to produce a desired product. It keeps the environment controlled by managing aeration (air supply), agitation (mixing), temperature, and pH. There are two main stages: upstream and downstream processes.
In simple words: A bioreactor is a large tank where living things like bacteria grow in controlled conditions to make useful products.

🎯 Exam Tip: Focus on "controlled environment" and "production of desired product" as main points when defining a bioreactor.

 

Question 3. Differentiate between upstream & downstream process
Answer:
Upstream process:
1. This is the first part of the production process.
2. It includes all preparations done before the main process starts.
3. This involves sterilizing the bioreactor, preparing the culture medium, sterilizing the medium, and growing the suitable inoculum (starting culture).
Downstream process:
1. This process happens after the upstream and fermentation stages.
2. It includes all the steps that follow the fermentation process.
3. This involves distillation, centrifuging, filtration, and solvent extraction. It mostly focuses on purifying the desired product.
In simple words: Upstream is about preparing everything for fermentation, like getting the cells ready. Downstream is about cleaning and collecting the final product after fermentation.

🎯 Exam Tip: Remember that upstream sets up the biological reaction, and downstream isolates and purifies the product from that reaction.

 

Question 4. Explain the role of Agrobacterium as a vector in gene transfer.
Answer: The Ti plasmid is found in *Agrobacterium tumefaciens*, a bacterium that causes tumors in many dicot plants. This plasmid has a 'transfer' gene which helps move a part of its DNA, called T-DNA, from the bacterium into other bacterial cells or plant cells. The Ti plasmid also contains genes for tumor formation, replication origin, and incompatibility. When *Agrobacterium* infects a wounded plant, it naturally transfers the T-DNA region of its plasmid into the plant's genome. Because of this natural ability to transfer genes, *Agrobacterium* is often called a "natural genetic engineer of plants" and is widely used to introduce desired traits into plants.
In simple words: *Agrobacterium* is like a natural delivery truck for genes in plants. It uses its Ti plasmid to put new DNA into plant cells, which scientists use to add useful traits to crops.

🎯 Exam Tip: Highlight the T-DNA transfer mechanism and its application in creating transgenic plants as key points.

 

Question 5. Write down the various Applications of SCP. SCP is used in various ways
Answer: Single Cell Protein (SCP) has many applications:
• It is used as a protein supplement.
• It is a component in cosmetic products for healthy hair and skin.
• The poultry industry uses it as an excellent source of protein-rich food for animals.
• In the food industry, SCP can act as a carrier for aroma compounds, vitamins, and emulsifying agents. It improves the nutritional value of baked goods and ready-to-serve meals.
• It is also used as a foam stabilizer in paper and leather processing.
In simple words: SCP is used as a protein boost in food for people and animals, in cosmetics, and even in industries like paper making to make things better.

🎯 Exam Tip: Remember that SCP is a versatile protein source with uses across food, cosmetics, animal feed, and industrial applications.

 

Question 6. What is barcode in genetic term?
Answer: In genetic terms, a barcode refers to a unique genetic sequence that helps identify a particular species or organism based on its genetic makeup. It is a specific genetic form used to identify a taxon (group of organisms) based on its distinct genetic signature. This is like an optical, machine-readable representation of data that describes the characteristics of plants or objects. It allows for quick and accurate identification. Scientists often use specific genes as "barcodes" to tell different species apart.
In simple words: A genetic barcode is a special DNA sequence that helps identify different types of living things, just like how a store barcode identifies a product.

🎯 Exam Tip: The core idea of a genetic barcode is species identification through a unique, standardized genetic sequence.

 

Question 7. Define Genome or Gene editing.
Answer: Genome editing, also called gene editing, refers to a group of technologies that allow scientists to change an organism's DNA. These technologies make it possible to add, remove, or alter genetic material at specific locations within the genome. For example, CRISPR-mediated gene replacement can allow rice to be switched from sexual to asexual reproduction. This precision helps in correcting genetic defects or introducing new desired traits.
In simple words: Genome editing is a way to change an organism's DNA by adding, removing, or changing specific parts of its genes.

🎯 Exam Tip: The key aspects of gene editing are its ability to make precise changes (add, remove, alter) to DNA at specific sites.

 

Question 8. What are the (believed to be) Risks of GM Food
Answer: There are several believed risks associated with Genetically Modified (GM) foods:
• **Health Hazards:** Concerns include potential effects on liver and kidney function, possibly contributing to cancer.
• **Hormonal Imbalance and Physical Disorder:** Some believe GM foods could lead to issues with hormones and overall physical health.
• **Anaphylactic Shocks:** There is a risk of sudden, severe allergic reactions (hypersensitive reactions) or other allergies.
• **Adverse Effects on Immune System:** Interference with bacterial proteins might negatively impact the immune system.
• **Loss of Seed Viability:** GM crops might use "terminator seed technology," where seeds from modified plants cannot produce fertile offspring, requiring farmers to buy new seeds each season. This can affect the natural microbial population in the soil.
In simple words: GM foods might cause health problems like allergies or affect organs. They could also disturb hormones or harm beneficial microbes in the soil, and some seeds might not grow new plants.

🎯 Exam Tip: When discussing risks, cover both direct health impacts (allergies, organ issues) and environmental/agricultural concerns (seed viability, soil microbes).

 

Question 9. Blot & differentiate it from western Blot?.
Answer: **Northern Blot:**
• Alwin et al. (1979) created this special technique for hybridization to transfer RNA bands.
• Amino Benzyloxymethyl paper is used as the filter paper, which can be prepared from Whatman 540 paper.
**Western Blot:**
• This method involves the electrophoretic transfer of proteins to blotting papers.
• Nitrocellulose filter paper is commonly used.
• A specific protein is identified by probing the blot with a radiolabeled antibody. This antibody binds to the target protein, which is then detected. This means a particular protein can be identified by using an antibody that matches it.
In simple words: Northern Blot is for finding specific RNA pieces, using a special paper. Western Blot is for finding specific proteins, also using special paper and an antibody.

🎯 Exam Tip: The key difference is the molecule being detected: Northern Blot for RNA, Western Blot for proteins. Southern Blot (not asked here) is for DNA.

 

Question 10. How are the flavr-savr type of Tomatoes formed?.
Answer: Flavr Savr tomatoes are created using genetic engineering to delay ripening and extend shelf life.
• Normally, the natural genes in tomatoes produce an enzyme called polygalacturonase. This enzyme causes the fruit to ripen, soften, and eventually spoil.
• In Flavr Savr tomatoes, "antisense RNA" genes are inserted into the tomato plant using *Agrobacterium* gene transfer. Antisense RNA interferes with the production of polygalacturonase.
• By reducing this enzyme, the ripening and softening process is delayed, which significantly increases the shelf life of the fruit. This allows transgenic tomatoes to be transported over long distances without spoiling quickly. This helps reduce waste and makes tomatoes available for longer.
In simple words: Flavr Savr tomatoes are genetically changed so they ripen and soften much slower. This makes them last longer and easier to transport without getting spoiled.

🎯 Exam Tip: Focus on the polygalacturonase enzyme and how antisense RNA inhibits its action to explain the delayed ripening.

 

Question 11. Western blot test is more perfect than ELISA. How?
Answer: Both ELISA (Enzyme-Linked Immunosorbent Assay) and Western Blotting are indirect tests that measure the immune system's response to an infectious agent, rather than directly looking for the agent itself. However, Western Blot is considered more perfect than ELISA due to its higher specificity and ability to distinguish false positives.
**ELISA Test:**
• Detects antibodies that the body starts to produce between 2-12 weeks after being infected.
• It is a qualitative, sensitive test but is not as confirmative as Western Blot.
• Example: Used for HIV - AIDS screening.
**Western Blot Test:**
• It is a confirmative test, meaning it is more reliable.
• It is less likely to show false positive results because it can effectively distinguish between different anti-bodies of a particular disease from other antibodies. This is achieved by separating proteins before detection.
• It is a clear confirmative test.
• Example: Used for HIV - AIDS confirmation.
Western Blot is better because it separates proteins first, allowing it to specifically identify multiple antibodies and confirm the presence of a disease with higher accuracy than ELISA, which can sometimes give false positives due to less specific antibody detection.
In simple words: Western blot is better than ELISA because it can separate different proteins and confirm specific antibodies more accurately, making it less likely to give wrong results.

🎯 Exam Tip: The key advantage of Western Blot is its ability to separate proteins and detect multiple specific antibodies, leading to higher confidence in results compared to ELISA.

VII. Five marks

 

Question 1. Upstream process, fermentation process & downstream process are the 3 steps.
Answer: The three main steps in a biotechnology production process are the upstream process, fermentation process, and downstream process:
1. **Upstream Process (Preparation):** This initial phase involves preparing everything needed before fermentation.
• Sterilization of the fermenter: Ensures the bioreactor is clean and free from unwanted microbes.
• Sterilization of the culture medium: The nutrient broth for microbes is made sterile.
• Growth of the suitable inoculum: Preparing the starting culture of desired microorganisms.
2. **Fermentation Process:** This is where the actual biological conversion happens. The prepared inoculum grows in the sterile culture medium within the bioreactor under controlled conditions to produce the desired product.
3. **Downstream Process (Purification):** This phase follows fermentation and involves all the steps to isolate and purify the desired product.
• Distillation: Separating components based on boiling points.
• Centrifuging: Separating solids from liquids using centrifugal force.
• Filtration: Removing solid particles from the liquid.
• Solvent extraction: Using a solvent to extract the product.
These three stages ensure an efficient and clean production of biotechnological products. The successful execution of each stage is vital for the overall yield and purity. For fermentation to occur correctly, the upstream process is crucial; without the right inoculum or sterilization, contamination can spoil the culture.
In simple words: The process has three steps: preparing everything (upstream), making the product in a tank (fermentation), and then cleaning and collecting the product (downstream). Each step is important for getting a good, pure final product.

🎯 Exam Tip: Clearly define what happens at each stage: preparation and inoculation (upstream), main biological reaction (fermentation), and isolation/purification (downstream).

 

Question 2. Antibiotic resistant maker is a useful selective marker - Explain.
Answer: An Antibiotic Resistant Marker (ARM) is a gene that, when introduced into bacterial cells (as part of a recombinant plasmid), produces a protein that gives the bacteria resistance to specific antibiotics. This gene acts as a tool to help scientists identify which bacterial cells have successfully taken up the new genetic material.
• Recombinant cells (those that have received the new DNA including the ARM) can grow well in a medium containing antibiotics like ampicillin, chloramphenicol, tetracycline, or kanamycin.
• Non-recombinant cells (those that have not received the new DNA) will not be able to grow in these media because they lack the antibiotic resistance gene and will be killed by the antibiotic.
Therefore, an antibiotic resistant marker is a useful selectable marker in distinguishing between transformed (recombinant) cells and non-transformed cells, allowing scientists to select only the cells that carry the desired gene.
In simple words: An antibiotic resistant marker is a gene that makes bacteria immune to an antibiotic. It helps scientists find bacteria that have taken in new DNA because only these will survive when exposed to the antibiotic.

🎯 Exam Tip: Emphasize that selectable markers like antibiotic resistance genes are essential for distinguishing and isolating cells that have successfully incorporated recombinant DNA from those that haven't.

 

Question 3. How will you select the transformed cells using Replica plating technique?
Answer: The replica plating technique is used to select transformed cells by copying the pattern of bacterial colonies from one culture plate to others, allowing for differential growth conditions.
**Procedure:**
• First, a master culture plate with growing bacterial colonies is prepared, some of which may be infected (transformed) and some not.
• A sterile filter paper or velvet pad is then pressed gently against this master plate (A) to pick up a sample of the colonies, creating a "replica."
• This replica (B) is then pressed onto a new sterile culture plate (C) that contains an antibiotic or another selective agent.
• The new plate (C) will show growth only for the colonies that have been successfully transformed with the antibiotic resistance gene (or other selective marker). Colonies that did not take up the new DNA will not grow on the selective plate.
This study can be repeated under different conditions, for example, by adding an antibiotic or a specific growth factor to further confirm and select the transformed cells.
In simple words: Replica plating helps find modified cells by making copies of bacteria from a main plate onto new plates with special conditions, like antibiotics. Only the modified cells will grow on these new plates.

🎯 Exam Tip: Understand that replica plating is a method of selective screening, allowing identical colony patterns to be tested under different conditions to identify specific traits like antibiotic resistance.

 

Question 4. Explain the separation & Isolation of DNA using GEL Electrophoresis.
Answer: Gel electrophoresis is a technique used to separate and isolate DNA fragments based on their size and charge.
• **Medium:** Agarose gel is a common medium used for this process. It acts as a three-dimensional matrix, forming a sieve that DNA molecules migrate through. Polycrylamide gel is used for separating smaller DNA fragments.
• **DNA Migration:** DNA molecules are negatively charged due to their phosphate backbone. When an electric field is applied, DNA fragments move towards the positive pole (anode).
• **Separation by Size:** Smaller DNA fragments can move more easily and quickly through the gel matrix compared to larger fragments. This causes the DNA fragments to separate into distinct bands according to their size (e.g., from a few hundred base pairs to 20,000 base pairs).
• **Detection:** After separation, the DNA bands in the gel can be stained with a dye like Ethidium Bromide. When exposed to UV light, the DNA bands fluoresce orange and become visible. This allows for their detection and can also be photographed.
• **Size Estimation:** Marker DNA fragments of known sizes are run alongside the sample DNA. By comparing the migration distance of the sample DNA to the known markers, the size of unknown DNA molecules can be accurately estimated by interpolation. This technique is highly sensitive, allowing for clear detection of DNA bands.
In simple words: Gel electrophoresis separates DNA pieces by size. DNA is put into a gel, and electricity pulls the small pieces faster than the big ones. Then, a special dye makes the DNA visible under UV light, showing the different sized pieces.

🎯 Exam Tip: Remember the key principles: DNA's negative charge, migration towards the positive electrode, and separation based on fragment size through the gel matrix.

 

Question 6. Explain RNA or RNA-Interference or RNA mediated gene silencing
Answer: RNA interference (RNAi), also known as RNA-mediated gene silencing, is a natural biological process in which RNA molecules regulate gene expression or suppress gene activity.
**Definition:** RNAi is a phenomenon where double-stranded RNA (dsRNA) molecules specifically target and inactivate messenger RNA (mRNA). This process prevents the mRNA from being translated into protein, thereby inhibiting or neutralizing its gene expression.
**Steps:**
**Step-I (Initiation):**
• Trigger RNA (either dsRNA or microRNA primary transcript) enters the cell.
• An enzyme called RNase II (Dicer & Drosha) cuts this trigger RNA into short interfering RNA (siRNA) molecules.
**Step-II (Effector Phase):**
• The siRNA is loaded into a RISC (RNA-induced silencing complex) assembly.
• Inside the RISC, the siRNA is unzipped, and a single-stranded RNA molecule is formed.
• This single-stranded RNA then hybridizes (binds) to its specific target site on the mRNA.
• The RISC complex cleaves or breaks the particular site on the mRNA. This cleavage prevents the mRNA from being translated, effectively silencing the gene.
**Example:** A common application is in plant protection against nematodes, where this process helps plants resist pests.
This mechanism is a powerful tool for gene regulation and is utilized in biotechnology for various applications, including crop protection and gene function studies.
In simple words: RNA interference is like a switch that turns off specific genes. Special small RNA molecules find and destroy the message (mRNA) from a gene, stopping it from making proteins. This is used to protect plants from pests.

🎯 Exam Tip: Key terms to remember are dsRNA, siRNA, Dicer, RISC, and the outcome: inhibition of mRNA translation leading to gene silencing.

 

Question 7. Explain Herbicide tolerant - Basta or Notes on PPT & PAT with reference to Herbicide resistance.
Answer: Herbicide tolerance, specifically with Basta, involves genetically engineering plants to resist herbicides like Phosphinothricin.
1. **Basta** refers to a non-selective herbicide containing the chemical compound **Phosphinothricin (PPT)**. This compound inhibits the enzyme glutamine synthetase, which is vital for ammonia assimilation in plants. If this enzyme is inhibited, the plant cannot properly process ammonia, leading to its death.
**Steps to create Basta-herbicide tolerant plants:**
• The **PPT** (Phosphinothricin) herbicide tolerant gene is extracted from the bacterium *Medicago sativa* plant.
• This gene is then introduced into a tobacco plant, making the transgenic tobacco resistant to PPT.
2. Similarly, the **PAT** (Phosphinothricin Acetyl Transferase) gene is extracted from *Streptomyces hygroscopicus*. This gene encodes for the PAT enzyme, which deactivates phosphinothricin.
• This PAT gene is then introduced into a potato or sugar beet plant.
• The resulting transgenic potato or sugar beet becomes resistant to PPT.
These genetic modifications allow crops to survive herbicide application, while weeds are killed. This helps farmers control weeds more effectively without harming their crops.
In simple words: Scientists make plants resistant to weed killers like Basta. They put a special gene into the plant that either makes the weed killer not work (like the PAT gene) or allows the plant to handle the weed killer (like the PPT gene from *Medicago sativa*). This way, only the weeds die, and the crop stays safe.

🎯 Exam Tip: For herbicide tolerance, focus on the specific herbicide (Phosphinothricin), the enzyme it inhibits (glutamine synthetase), and how the inserted genes (PPT or PAT) provide resistance.

 

Question 8. Give a tabulation of some transgenic plants & their applications.
Answer: Transgenic plants are genetically modified crops engineered for various beneficial applications. Here's a table showing some examples:

These examples show how genetic engineering can improve crop characteristics, making them more resistant to pests, higher yielding, or more nutritious. This helps address food security and agricultural challenges.
In simple words: Many plants are changed to be better. Bt cotton fights worms, Golden rice has more vitamin A, and Flavr Savr tomatoes stay fresh longer.

🎯 Exam Tip: For each transgenic plant, remember its specific modification and the benefit it provides (e.g., pest resistance, enhanced nutrition, extended shelf life).

 

Question 9. Distinguish between the bio polymers PHB, PHA & PLA.
Answer: Biopolymers like PHB, PHA, and PLA are biodegradable plastics with distinct characteristics. Here's a comparison:

These biopolymers offer environmentally friendly alternatives to traditional plastics, with applications ranging from medical devices to packaging. They are designed to break down naturally, reducing pollution.
In simple words: PHB, PHA, and PLA are types of plastics made from living things that can break down naturally. They come from different sources and are used for various things, from medicine to everyday products.

🎯 Exam Tip: When distinguishing, focus on the full name (expansion), source organisms or materials, and key applications of each biopolymer.

 

Question 10. Give the protocol for the herbicide glyphosate tolerant potato plant.
Answer: The protocol for developing a herbicide-tolerant potato plant, specifically for glyphosate tolerance, involves several steps using genetic engineering:
1. **Gene Introduction:** The first step is to introduce the 'bar' gene into potato cells. The 'bar' gene provides resistance to certain herbicides, including glyphosate. This gene is typically transferred using a vector, often *Agrobacterium tumefaciens*.
2. **Cell Culture:** Potato cells are then cultured in vitro (in a test tube or petri dish) on a suitable medium. This creates a callus, which is a mass of undifferentiated plant cells.
3. **Organogenesis:** The callus is induced to undergo organogenesis, meaning it develops into shoots and roots, eventually forming whole plantlets.
4. **Selection and Regeneration:** These plantlets are then grown on a selective medium containing the herbicide. Only the cells that have successfully integrated the 'bar' gene and are tolerant to the herbicide will survive and grow. These selected plantlets are then regenerated into full potato plants.
5. **Development of Transgenic Plants:** The final result is a transgenic potato plant that is tolerant to herbicides like glyphosate. This allows farmers to spray fields with herbicide, killing weeds without harming the potato crop, thereby improving weed control and crop yield.
This process allows for the creation of crops that can withstand specific herbicides, making weed management more efficient.
In simple words: To make potatoes resist weed killer (glyphosate), scientists put a special gene, called 'bar', into potato cells. They grow these cells in a lab, make them grow into small plants, and then pick only the ones that can survive the weed killer. These grown-up plants will then be resistant to glyphosate.

🎯 Exam Tip: Outline the steps clearly: gene insertion via vector, tissue culture (callus formation), regeneration, and selection under herbicide, leading to a tolerant plant.

 

Question 13. Explain the Bio piracy attempt on Neem & Turmeric.
Answer: Biopiracy happens when natural resources and traditional knowledge are used without permission or fair payment. For example, some companies tried to get patents for neem and turmeric's medicinal uses, even though these uses were already well-known in India for thousands of years. This sparked legal battles where India fought to protect its traditional knowledge. Using local knowledge without proper consent is an act of biopiracy.
In simple words: Biopiracy means taking traditional knowledge or natural things from a country without asking or paying fairly. This happened with neem and turmeric when others tried to claim their traditional uses.

🎯 Exam Tip: When explaining biopiracy, always mention both the unauthorized use of resources/knowledge and the lack of fair compensation or approval.

 

Question 14. Explain the Biopiracy of 'Basmati's, and how India fought back its rights?
Answer:

In simple words: A company tried to patent Basmati rice, which is traditionally from India. India fought back through legal channels to protect its unique rice and succeeded in making the company drop most of its claims.

🎯 Exam Tip: When comparing biopiracy cases, always highlight the traditional origin of the resource, the specific unauthorized claim made, and the methods used to protect the rights.

 

Question 15. What are the applications of Biotechnology?
Answer: Biotechnology has many important applications across different fields, improving human life and various industries. It uses living organisms or their parts to create products and technologies.
I. Agriculture - Transgenic plants
Many crops like Bt. cotton, Bt. brinjal, Golden rice, Flavr Savr tomato, Cauliflower, Potato, and Banana are examples of biotechnology. These varieties are resistant to pests, stress, and diseases.
II. Medicine:

• Insulin produced by recombinant DNA technology is a major medical advancement.
• Vaccines, enzymes, antibiotics, dairy products, and beverages are also products of biotechnology.

III. Biochip:
Biochip-based biological computers use biotechnology principles.
IV. Genetic engineering:
It involves:

• Gene manipulation
• Tissue culture
• Single-cell protein (used in the food industry), like SCP
• Secondary metabolites and other products
• Biofertilizers and biopesticides

V. Environmental aspects Include

• Bio mass-energy production
• Biofuel creation
• Bioremediation and phytoremediation (cleaning up pollution)
• Environmental biotechnology overall

In simple words: Biotechnology helps in many areas like making stronger crops, creating medicines like insulin, and even cleaning up the environment. It uses living things to solve problems and make useful products.

🎯 Exam Tip: When listing applications, categorize them into broad fields like agriculture, medicine, and environment for a clear and organized answer.

 

Question 16. Give the explanation in a single or two sentences for various terms.
Answer:
1. Bio-pesticide: This is a pesticide made from natural sources like plants, bacteria, or animals. It helps control pests in an eco-friendly way.
2. Bio-fertilizer: These are substances that contain living microorganisms which, when applied to seeds, plant surfaces, or soil, colonize the rhizosphere or the interior of the plant and promote growth by increasing the supply or availability of primary nutrients to the host plant. They provide nutrients from biological sources, including plants, animals, and microbes.
3. Bio venting: This is a process that increases oxygen levels to speed up the breakdown of environmental pollutants. It helps clean up contaminated areas naturally.
4. Bio leaching: This method uses microbes in a liquid solution to recover poisonous metals from contaminated soil. It is a way to extract valuable metals or remove harmful ones.
5. Bioprospecting: This is the process of finding and studying new natural products from biological resources for commercial use. It explores nature for potential medicines or other valuable compounds.
6. Bio-pharming: This involves using genetically engineered plants or microbes to produce pharmaceutical products. These products can include vaccines or therapeutic proteins for human use.
7. BioFuel: This is fuel made from plants, microbes, or algae, serving as an alternative energy source. Biofuels are renewable and can reduce reliance on fossil fuels.
8. Biofortification: This is a process of improving crops to enhance their nutritional value through traditional breeding or genetic engineering. It makes food richer in vitamins and minerals.
9. Bioremediation: This uses plants or microbes to clean up environmental pollutants. It is a natural way to detoxify contaminated soil and water.
10. Biopiracy: This involves using traditional knowledge or inventions from developing countries without proper approval or fair payment. It exploits the knowledge of local communities.
11. Bio patency: This refers to the exclusive legal right granted to an inventor, preventing others from using their knowledge or invention without permission. It protects the intellectual property of scientific discoveries.
12. Bio chip: This is a small microchip designed to perform biological functions or operate inside the body of an organism. It can be used for diagnostics or drug delivery.In simple words: These terms describe different ways biotechnology uses living things for good. They cover everything from making natural pesticides and fertilizers to cleaning pollution and creating new medicines.

🎯 Exam Tip: For definitions, keep them concise and focus on the key action or purpose of each term. An example or a brief benefit can strengthen the explanation.