CBSE Class 12 Chemistry Biomolecules VBQs

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VBQ for Class 12 Chemistry Unit 14 Biomolecules

Class 12 Chemistry students should refer to the following value based questions with answers for Unit 14 Biomolecules in Class 12. These VBQ questions with answers for Class 12 Chemistry will come in exams and help you to score good marks

Unit 14 Biomolecules VBQ Questions Class 12 Chemistry with Answers

Question. Which of the following reagents does not react with glucose?
a) NH2OH
b) HCN
c) 2, 4 –DNP reagent
d) Br2 water
Answer. C

Question. What are the hydrolysis products of lactose?
a) 𝞫–D-galactose and 𝞫 –D-Glucose
b) α –D-Glucose and α –D-Glucose
c) α –D-Glucose and 𝞫 –D-Fructose
d) None of these
Answer. A

Question. Which of the following is/are example(s) of denaturation of protein?
a) Coagulation of egg white
b) Curding of milk
c) Clotting of blood
d) Both (a) and (b)
Answer. D

Question. Which of the following vitamins given below is water-soluble?
a) Vitamin C
b) Vitamin D
c) Vitamin A
d) Vitamin E
Answer. A

Question. Scurvy is caused due to deficiency of
a) Vitamin B1
b) Vitamin B2
c) Ascorbic acid
d) Glutamic acid
Answer. C


ASSERTION REASON TYPE QUESTIONS

Question. Assertion: In presence of enzyme, substrate molecule can be attacked by the reagent effectively.
Reason: Active sites of enzymes hold the substrate molecule in a suitable position.
Answer. A

Question. Assertion: All naturally occurring α-aminoacids except glycine are optically active.
Reason: Most naturally occurring amino acids have D-configuration.
Answer. C

Question. Assertion: Glucose gives a reddish brown precipitate with Fehling’s solution.
Reason: Reaction of glucose with Fehling’s solution gives CuO and gluconic acid.
Answer. C

Question. Assertion: Fructose reduces Fehling’s solution and Tollens’ reagent.
Reason: Fructose does not contain any aldehyde group.
Answer. B

Question. Assertion: The Ka values of alpha amino acids are very low.
Reason: alpha Amino acids have zwitterionic structures.
Answer. B


CASE BASED QUESTIONS

II Carbohydrates are polyhydroxy aldehydes or ketones and are also called saccharides. Monosaccharides containing aldehyde group are called aldoses while those containing a keto group are called ketoses. Glucose is an example of monosaccharides. Glucose (C6H12O6) is an aldohexose and its open chain structure was assigned on the basis of many reactions as evidences like presence of carbonyl group, presence of straight chain, presence of five-OH groups, etc. Glucose is correctly named as D(+)Glucose. Glucose is found to exist in two different crystalline forms which are named as α and 𝞫.

Question. Glucose on oxidation with nitric acid gives a dicarboxylic acid called saccharic acid. This result validates the fact that glucose possesses
a) –CHO group
b)-OH group
c) straight chain
d) both –CHO and –CH2OH groups at the terminals of the chain
Answer. D

Question. The pentaacetate of glucose does not react with hydroxyl amine indicating the absence of
a)-OH group
b) -CHO group
c)-COOH group
d) –CH2OH group
Answer. B

Question. α-D(+)-glucose and 𝞫- D(+)-glucose are
a) enantiomers
b) conformers
c) epimers
d) Anomers
Answer. D

Question. Which of the following pairs give positive Tollen’s test?
a) Glucose, Fructose
b) Glucose, Sucrose
c) Fructose, Sucrose
d) Sucrose, Maltose
Answer. A

Question. Which of the following is a keto hexose?
a) Glucose
b) Galactose
c) Fructose
d) Mannose
Answer. C

 

SHORT ANSWER TYPE QUESTIONS

Question. What is meant by (a) a peptide linkage (b) a glycosidic linkage
Answer. (a) Peptide bond is formed by the condensation of two or more same or different alpha amino acids. The condensation occurs between amino acids with the elimination of water. In this case, the carboxyl group of one amino acid and amino group of another amino acid get condensed with the elimination of water molecule. The resulting- CONH – linkage is called peptide linkage.
(b)Two monosaccharide units are linked to each other by a bond called glycosidic linkage.

Question. Why vitamin C cannot be stored in our body?
Answer. Vitamin C cannot be stored in our body because it is soluble in water and is readly excreted in urine and cannot be stored in our body.

Question. Name the 3 nitrogenous bases having pyrimidine ring present in nucleic acids.
Answer. Cytosine Thymine and uracil

Question. Distinguish between globular protein and fibrous protein.
Answer.  In globular proteins,the molecules are folded together into compact units forming spheroidal shapes. The peptide chains are held by hydrogen bonds, but these forces are comparatively weak. These are soluble in water. eg. albumin, insulin.
Fibrous proteins consist of linear thread like molecules which tend to lie side by side to form fibres. The molecules are held together at many points by hydrogen bonds or disulphide bonds.eg. keratin. Myosin

Question. Define the following terms
(a) nucleotide (b) anomers (c)essential amino acids
Answer. (a) A unit formed by the combination of a nitrogen containing heterocyclic base, a pentose sugar and a phosphoric acid group.
(b)The anomers are the isomers formed due to the change in configuration of – OH group at C1 of glucose. eg. alpha and beta forms of glucose.
(c)The amino acids which cannot be made by our bodies and must be supplied in our diet for the growth of the body are called essential amino acids.

Question. (a) Write one reaction of D-glucose which cannot be explained by its open chain structure.
(b) What type of linkage is present in nucleic acids
Answer. (a)Despite having aldehydic (-CHO) group, glucose does not react with NaHSO3 to form addition product.
(b)phosphodiester linkage.

Question. Write two differences between DNA and RNA
Answer. The bases present in RNA are guanine, adenine, cytosine and uracil.
Uracil is not present in DNA. Instead, it contains thymine.
DNA has double stranded alpha helix structure in which two strands are coiled spirally in opposite directions. The sugar molecule present in DNA is 2-deoxyribose.
RNA has single stranded alpha helix structure. The sugar molecule present in RNA is ribose.

Question. Define the following terms with a suitable example of each:
(a) Anomers
Answer. Anomers: Carbohydrates that differ in configuration at the glycosidic carbon (i.e. C1 in aldoses and C2 in ketoses) are called anomers. For example, α-D-glucose and β-D- glucose.
(b) Essential amino acids
Answer. Essential amino acids: The amino acids which cannot be made by our bodies and must be supplied in our diet are called essential amino acids. For example, valine, leucine, etc.
(c) Denaturation of protein
Answer. A process that changes the native conformation of a protein is called denaturation. The denaturation can be caused by changes in pH, temperature, presence of salts of certain chemical agents. The denatured protein will lose its biological activity. During denaturation, the protein molecule uncoils from an ordered and specific conformation into a more random conformation and protein precipitates from the solution. For example, when an egg is boiled in water, the globular proteins present in it change to a rubber-like insoluble mass.

Question. How are vitamins classified? Name the vitamin responsible for the coagulation of blood.
Answer. Vitamins are classified into:
Water-insoluble vitamins: These are fat-soluble substances E.g. Vitamin A, D, E and K.
Water-soluble vitamins: These include Vitamin B-Complex and Vitamin C (except B12).
Vitamin K or phylloquinone is responsible for the coagulation of blood.

Question. Glucose is an aldose sugar but it does not react with sodium hydrogen sulphite. Give a reason.
Answer. An aldehyde group is present in glucose. It, on the other hand, does not react with sodium hydrogen sulphite to generate bisulphite addition products. This is because this reaction takes place in the presence of a free aldehyde group, but there is no free - CHO group in glucose's structure.

Question. The teacher fixed five cards on the flannel board that marked A, T, C, U, G,pick up cards that indicate bases that are not common to all nucleic acids.
a) Which cards would Rakesh pick from the five?
b) Of the nucleic acids picked by Rakesh, which does not form hydrogen bonding with other nucleic acids?
c) What are the values involved in this exercise?
Answer:  a) T and U
b) U
c) Scientific attitude.

Question. Sudha’s mother received a phone call on Monday morning from a closerelative stating that three of them would be coming over for lunch. Sudha’s mother noticed that she did not have enough curd to serve the guests. Sudhaa class XII student suggested that her mother could warm the milk from the refrigerator or keep it under direct sunlight and curdle it.
a) Why do you think Sudha suggested the above methods?
b) Will it be helpful if her mother followed Sudha’s suggestion?
c) What values are associated with Sudha’s suggestion?
Answer: a) Because she learnt in chemistry that proteins get denatured and results coagulation of milk at high temperature.
b) Yes
c) Critical thinking and problem analysis.

Question. Nita’s mother fell ill and the doctor diagnosed her with pernicious anemia. She felt lethargic and did not have the energy to do work. Nita helped her mother in household work till she recovered.
a) Name the vitamin whose deficiency caused pernicious anemia.
b) Name the sources which will provides this vitamin.
c) Mention the values shown by Nita.
Answer: a) Vitamin A
b) Carrot, green leafy vegetables, milk, etc.
c) Self Awareness.

Question. Rajni asked her maid to prepare halwa for her diabetic mother-in-law. Her maidadded sugar free tablet containing two amino acids in the boiling contents.Rajni scolded her maid for this action.
a) In your opinion, why Rajni did so?
b) Mention values associated with your opinion.
Answer:
a) Amino acids like cysteine has negative effect on insulin as it alter its shape
and make them unable to metabolize sugar.
b) self awarenesss

Question. Starch is one of the most important food material for all of us. But Rajesh was advised by his Physical not to avoid it, as he was suffered with Diabetes Mellitus, but one day while his trip to forest he strayed from the rout and keep on going to find the right path but in vain, finally he completely tired off and had appetite, on searching food he found nothing to eat except a few sweet potatoes he carried in a small bag with him by mistake from his home. Now answer whether to eat these sweet potatoes, justify your answer supporting the any 2 values associated with.

Question. Shudha when taught by the teacher in the class room that vitamin is B12 contains a metal ion, now after the class when student will go to home they will find the tell the name of the Metal ion tomorrow, but Sudha immediate after during the interval time went to the Computer lab and requested the teacher to surf the net and traced the name of the metal ion, now write down the name of the metal ion state at least 2 moral virtues possessed by Sudha

Question. DNA and RNA are the two important nucleic acids present in our body. They are very important in our life. Study of DNA is very useful in investigation of criminal cases and finding. In what ways study of DNA is useful to us? Explain. Write the value associated with this.

Question. In our diet we include good amount of plant products rich in cellulose but such diet is not nourishing. Explain the value you have learned about biomolecules.

Question. On medical checkup Snajit got to know that his vision is getting poor slowly. As soon his younger brother came to know the fact he rushed to the market to bring some mangoes, carrot & papaya, Why, what values do you find his younger brother possesses.

Please refer to the link below for CBSE Class 12 Chemistry - Biomolecules VBQs

Unit 08 The d- and f-Block Elements
CBSE Class 12 Chemistry D And F Block Elements VBQs
Unit 12 Aldehydes, Ketones and Carboxylic Acids
CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids VBQs

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CBSE Class 12 Chemistry Unit 14 Biomolecules VBQs

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