NCERT Solutions Class 12 Biology Chapter 11 Biotechnology Principles And Processes

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NCERT Solutions Class 12 Biology Chapter 11 Biotechnology Principles And Processes. The NCERT solutions for Class 11 Mathematics have been made by Mathematics teacher of one of the best CBSE school in India. These NCERT solutions have been made to give detailed answers and expanations of the concepts as per NCERT which can be easily understood by the students. Refer to other links also to download mathematics NCERT solutions, worksheets, sample papers and Exemplar Solutions. 

Class 12 Biology

NCERT Solutions

Chapter 11 Biotechnology: Principles And Processes

1.Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet).

Ans.(i) Human insulin – Diabetes

(ii)Human growth hormone – Dwarfism cure

(iii)Blood clotting factor Y1H/IX-Haemophilia

(iv)TPA (tissue plasminogen activator) – Heart attack/strokes

(v)PDGF (platelet derived growth factor) – Stimulates wound healing.

(vi)Interferon – Treatment of viral infection.

(vii)Interlinking – Enhances immune reaction, (viii) Hepatitis B vaccine – Prevention of infectious disease.

(ix)Herpes Vaccine – Prevention of infectious disease.

(x)DNase I – Treatment of cystic fibrosis.

2.Make a chart (with diagrammatic representation) showing a restriction enzyme, the substrate DNA on which it acts, the site at which it cuts DNA and the product it produces.

Ans. Name of the Restriction enzyme – Bam HI.

The substrate DNA on which it acts –


3. From what you have learnt, can you tell whether enzymes are bigger or DNA is bigger in molecular size? How did you know?

Ans. Enzymes are bigger than DNA as they are proteins and proteins are macromolecules made of amino acids which are bigger than nucleotides. This can also be proved by gel electrophoresis, where denatured protein would not move but denatured DNA will move to a distance. Protein synthesis is regulated by small portions of DNA, called genes.

4.What would be the molar concentration of human DNA in a human cell? Consult your teacher.

Ans. The molar concentration of DNA in human cell is 2 mg/ml of cell extract.

5.Do eukaryotic cells have restriction endonucleases? Justify your answer.

Ans. No, eukaryotic cells do not have restriction endonuclease because DNA molecules of eukaryotes are heavily methylated. All the restriction endonucleases have been isolated from various strain of bacteria.

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