CBSE Class 12 Chemistry Biomolecules Question Bank Set 02

Official Class 12 Chemistry Worksheets: Unit 10 Biomolecules

Review targeted practice sets for Class 12 Chemistry Unit 10 Biomolecules. Built according to official educational guidelines for the 2026-27 academic year, these downloadable worksheets support daily revision and core concept reinforcement.

Chapter-wise Practice Material: Unit 10 Biomolecules

Access the complete worksheet PDF for Unit 10 Biomolecules below. Regular practice with these targeted questions builds familiarity with standard exam patterns and helps secure higher marks in final Chemistry evaluations.

Question. Which is not true statement?
(a) a-Carbon of a-amino acid is asymmetric.
(b) All proteins are found in L-form.
(c) Human body can synthesise all proteins they need.
(d) At pH = 7 both amino and carboxylic groups exist in ionised form. 
Answer. B

Question. Which is the correct statement?
(a) Starch is a polymer of a-glucose.
(b) Amylose is a component of cellulose.
(c) Proteins are composed of only one type of amino acid.
(d) In cyclic structure of fructose, there are four carbons and one oxygen atom. 
Answer. A

Question. Haemoglobin is
(a) a vitamin
(b) a carbohydrate
(c) an enzyme
(d) a globular protein.
Answer. D

Question. The secondary structure of a protein refers to
(a) regular folding patterns of continuous portions of the polypeptide chain
(b) three-dimensional structure, specially the bond between amino acid residues that are distant from each other in the polypeptide chain
(c) mainly denatured proteins and structures of prosthetic groups
(d) linear sequence of amino acid residues in the polypeptide chain.
Answer. A

Question. Enzymes are made up of
(a) edible proteins
(b) proteins with specific structure
(c) nitrogen containing carbohydrates
(d) carbohydrates. 
Answer. B

Question. Which of the following is correct?
(a) Cycloheptane is an aromatic compound.
(b) Diastase is an enzyme.
(c) Acetophenone is an ether.
(d) All of these.
Answer. B

Question. The function of enzymes in the living system is to
(a) catalyse biochemical reactions
(b) provide energy
(c) transport oxygen
(d) provide immunity.
Answer. A

Question. Which of the following statements about enzymes is true?
(a) Enzymes catalyse chemical reactions by increasing the activation energy.
(b) Enzymes are highly specific both in binding chiral substrates and in catalysing their reactions.
(c) Enzymes lack in nucleophilic groups.
(d) Pepsin is proteolytic enzyme.
Answer. B

Question. Enzymes take part in a reaction and
(a) decrease the rate of a chemical reaction
(b) increase the rate of a chemical reaction
(c) both (a) and (b)
(d) none of these. 
Answer. B

Question. Deficiency of vitamin B1 causes the disease
(a) convulsions
(b) beri-beri
(c) cheilosis
(d) sterility. 
Answer. B

Question. Which of the following is not a fat soluble vitamin?
(a) Vitamin B complex
(b) Vitamin D
(c) Vitamin E
(d) Vitamin A 
Answer. A

Question. Which of the following vitamins is water soluble?
(a) Vitamin E
(b) Vitamin K
(c) Vitamin A
(d) Vitamin B 
Answer. D

Question. The human body does not produce
(a) enzymes
(b) DNA
(c) vitamins
(d) hormones. 
Answer. C

Question. Vitamin B12 contains
(a) Fe (II)
(b) Co (III)
(c) Zn (II)
(d) Ca (II) 
Answer. B

Question. The central dogma of molecular genetics states that the genetic information flows from
(a) Amino acids → Proteins → DNA
(b) DNA → Carbohydrates → Proteins
(c) DNA → RNA → Proteins
(d) DNA → RNA → Carbohydrates
Answer. C

Question. The correct statement regarding RNA and DNA, respectively is
(a) the sugar component in RNA is a arabinose and the sugar component in DNA is ribose
(b) the sugar component in RNA is 2′-deoxyribose and the sugar component in DNA is arabinose
(c) the sugar component in RNA is arabinose and the sugar component in DNA is 2′-deoxyribose
(d) the sugar component in RNA is ribose and the sugar component in DNA is 2′-deoxyribose.
Answer. D

Question. In DNA, the linkages between different nitrogenous bases are
(a) phosphate linkage
(b) H-bonding
(c) glycosidic linkage
(d) peptide linkage. 
Answer. B

Question. The segment of DNA which acts as the instrumental manual for the synthesis of the protein is
(a) ribose
(b) gene
(c) nucleoside
(d) nucleotide. 
Answer. B

Question. In DNA, the complimentary bases are
(a) adenine and guanine; thymine and cytosine
(b) uracil and adenine; cytosine and guanine
(c) adenine and thymine; guanine and cytosine
(d) adenine and thymine; guanine and uracil.
Answer. C

Question. RNA and DNA are chiral molecules, their chirality is due to
(a) chiral bases
(b) chiral phosphate ester units
(c) D-sugar component
(d) L-sugar component. 
Answer. C

Question. A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?
(a) Three
(b) Four
(c) One
(d) Two 
Answer. A

Question. Chargaff’s rule states that in an organism
(a) amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C)
(b) amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C)
(c) amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G)
(d) amounts of all bases are equal. 
Answer. A

Question. Which of the following is correct about H-bonding in nucleotide?
(a) A – T, G – C
(b) A – G , T – C
(c) G – T, A – C
(d) A – A, T – T
Answer. A

Question. An example of biopolymer is
(a) teflon
(b) neoprene
(c) nylon-6, 6
(d) DNA. 
Answer. D

Question. The couplings between base units of DNA is through
(a) hydrogen bonding
(b) electrostatic bonding
(c) covalent bonding
(d) van der Waals’ forces.
Answer. A

Question. Which of the following statements is not correct?
(a) Ovalbumin is a simple food reserve in eggwhite.
(b) Blood proteins thrombin and fibrinogen are involved in blood clotting.
(c) Denaturation makes the proteins more active.
(d) Insulin maintains sugar level in the blood of a human body. 
Answer. C

Question. Which of the following hormones is produced under the conditions of stress which stimulate glycogenolysis in the liver of human beings?
(a) Thyroxin
(b) Insulin
(c) Adrenaline
(d) Estradiol 
Answer. C

Question. Which of the following hormones contains iodine?
(a) Testosterone
(b) Adrenaline
(c) Thyroxine
(d) Insulin 
Answer. C

Question. Which of the following is an amine hormone?
(a) Insulin
(b) Progesterone
(c) Thyroxine
(d) Oxypurin 
Answer. C

Question. Which one of the following is a peptide hormone?
(a) Adrenaline
(b) Glucagon
(c) Testosterone
(d) Thyroxine 
Answer. B

Question. The hormone that helps in the conversion of glucose to glycogen is
(a) cortisone
(b) bile acids
(c) adrenaline
(d) insulin. 
Answer. D

Question. Which one is responsible for production of energy in biochemical reaction?
(a) Thyroxine
(b) Adrenaline
(c) Oestrogen
(d) Progesterone 
Answer. A

Question. The cell membranes are mainly composed of
(a) fats
(b) proteins
(c) phospholipids
(d) carbohydrates. 
Answer. C

Question. Phospholipids are esters of glycerol with
(a) three carboxylic acid residues
(b) two carboxylic acid residues and one phosphate group
(c) one carboxylic acid residue and two phosphate groups
(d) three phosphate groups. 
Answer. B

Question. The number of molecules of ATP produced in the lipid metabolism of a molecule of palmitic acid is
(a) 56
(b) 36
(c) 130
(d) 86
Answer. C

QUESTION BANK
 
1 Name a polysaccharide which is stored in the liver of animals. 
 
2 What structural feature is required for a carbohydrate to behave as reducing sugar?
 
3 How many asymmetric carbon atoms are present in D (+) glucose? 
 
4 Give the significance of (+)-sign in the name D-(+)-glucose. 
 
5 Glucose is an aldose sugar but it does not react with sodium hydrogen sulphite. Give reason.
 
6 Why is sucrose called invert sugar? 
 
7 Name the building blocks of proteins. 
 
8 Give the structure of simplest optically active amino acid. 
 
9 Name the amino acid which is not optically active. 
 
10 Name the enzyme which catalyses the hydrolysis of maltose into glucose 
 
11 How would you explain the amphoteric behavior of amino acids. 
 
12 Which forces are responsible for the stability of α– helical structure of proteins 
 
13 Which nucleic acid is responsible for carrying out protein synthesis in the cell.
 
14 The two strands in DNA are not identical but complementary. Explain. 
 
15 When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of RNA.
 
16 What type of linkage holds together the monomers of DNA and RNA. 
 
17 A child diagnosed with bone deformities, is likely to have the deficiency of which vitamin?
 
18 What is meant by the term DNA fingerprinting? 
 
19 Name the vitamin responsible for coagulation of blood 
 
20 Except vitamin B12, all other vitamins of group B, should be supplied regularly in diet. Why?
 
21 How is glucose prepared commercially? 
 
22 What is the structural difference between glucose and fructose? 
 
23 Which disaccharides are non – reducing sugars? 
 
24 What is the meaning of statement- Glucose is an aldohexose. 
 
25 Why are polysaccharides considered non- sugars? 
 
26 Name the reagents used to check the reducing nature of carbohydrates 
 
27 Name the forces responsible for secondary and tertiary structure. 
 
28 Name the different types of RNA molecules found in the cells of organisms. 
 
29 What is nucleoside? 
 
30 Write the sequence of bases in the complementary strand of the given strand -
 
AGGCTTAACCT
 
31 What are anomers. Give the structures of two anomers of glucose. 
 
32 Write the hydrolysed products of
(i) maltose (ii) cellulose.
 
33 Name the two components of starch? Which one is water soluble? 
 
34 i) Acetylation of glucose with acetic anhydride gives glucose pentaacetate. Write the structure of the pentaacetate.
ii) Explain why glucose pentaacetate does not react with hydroxylamine?
 
35 What are vitamins? How are they classified? 
 
36 Classify the following as monosaccharides or oligosaccharides.
(i) Ribose (ii) Maltose(iii) Galactose(iv) Lactose
 
37 Write the products of oxidation of glucose with
(a) Bromine water (b) Nitric acid
 
38 State two main differences between globular and fibrous proteins 
 
39 What are essential and non essential amino acids? Give one example of each type.
 
40 Classify the following as globular or fibrous proteins.
(i) Keratin (ii) Myosin(iii) Insulin (iv) Haemoglobin.
 
41 What do you understand by
(a) denaturation of protein (b) specificity of an enzyme
 
42 i) Name the disease caused by deficiency of vitamin D.
ii)Why cannot vitamin C be stored in our body?
 
43 Define the terms hypervitaminosis and avitaminosis. 
 
44 Explain what is meant by :
(i) a peptide linkage(ii) a glycosidic linkage?
 
45 What are the main functions of DNA and RNA in human body? 
 
46 Give the sources of vitamin A and E and name the deficiency diseases resulting from lack of vitamin A and E in the diet.
 
47 Give a reaction to prove that –
i) Glucose has carbonyl group
ii) The six carbons in glucose are arranged in a straight chain
 
48 Which reaction of glucose cannot be explained by its cyclic structure? 
49 What are the expected products of hydrolysis of
i) Sucrose
ii) Galactose
 
50 What is animal starch? Where is it found? 
 
51 Differentiate between α - helical and β- pleated sheet structure. 
 
52 What do you understand by secondary structure of proteins? 
 
53 How are carbohydrate classified? 
 
54 i) Name four bases present in DNA.
ii) Which of them is not present in RNA.
iii) Give the structure of a nucleotide of DNA.
 
55 Differentiate between the following :
i) Secondary and tertiary structure of protein.
ii) α-Helix and β-pleated sheet structure of protein
iii) Fibrous and globular proteins.

 

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Download CBSE Practice Material: Class 12 Chemistry Unit 10 Biomolecules

CBSE Practice Material: Class 12 Chemistry Unit 10 Biomolecules

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