Class 11 Biology Chapter 9: Biomolecules – 100 MCQs with Answers
1. The most abundant biomolecule on earth is:
Answer: A) Cellulose
2. The building blocks of proteins are:
Answer: B) Amino acids
3. Which of the following is a disaccharide?
Answer: C) Sucrose
4. Ribozyme is a:
Answer: C) Nucleic acid
5. The enzyme that converts glucose to glucose-6-phosphate is:
Answer: A) Hexokinase
6. The bond joining two amino acids is:
Answer: C) Peptide
7. Which of these is not a lipid?
Answer: C) Cellulose
8. The nucleotide is made up of:
Answer: A) Sugar, base, phosphate
9. Enzymes are chemically:
Answer: B) Proteins
10. The prosthetic group of a conjugated enzyme is called:
Answer: B) Coenzyme
11. The main component of a cell wall in plants:
Answer: C) Cellulose
12. Which is a type of storage polysaccharide in animals?
Answer: A) Glycogen
13. Enzymes increase the rate of reaction by:
Answer: B) Lowering activation energy
14. Which vitamin acts as a coenzyme in cellular respiration?
Answer: B) Vitamin B2
15. The functional three-dimensional structure of protein is:
Answer: C) Tertiary
16. Upon hydrolysis, fats yield:
Answer: A) Fatty acids and glycerol
17. The sugar in RNA is:
Answer: B) Ribose
18. The most abundant protein in animal world:
Answer: B) Collagen
19. The Zwitterionic form is found in:
Answer: C) Amino acids
20. Which is NOT a macromolecule?
Answer: D) Glucose
21. The simplest amino acid is:
Answer: A) Glycine
22. Nucleic acids are polymers of:
Answer: C) Nucleotides
23. Which is NOT a property of an enzyme?
Answer: C) Consumed in reaction
24. Which is a purine base?
Answer: B) Adenine
25. Maltose is formed from:
Answer: A) Two glucose
26. Which nitrogenous base is found only in RNA?
Answer: B) Uracil
27. Denaturation affects:
Answer: B) Tertiary structure
28. Molecular formula for glucose is:
Answer: B) C6H12O6
29. The maximum activity of an enzyme occurs at:
Answer: C) Optimum pH
30. Fats are insoluble in:
Answer: A) Water
31. Secondary structure of protein is stabilized by:
Answer: B) Hydrogen bond
32. DNA is mainly present in:
Answer: A) Nucleus
33. The enzyme that digests protein in the stomach:
Answer: B) Pepsin
34. Which is an aromatic amino acid?
Answer: B) Tryptophan
35. The chemical composition of enzymes is:
Answer: B) Proteins
36. Raffinose is a:
Answer: C) Trisaccharide
37. Which is a saturated fatty acid?
Answer: C) Palmitic acid
38. The vitamin soluble in water is:
Answer: C) Vitamin B1
39. The enzyme that converts starch to maltose:
Answer: A) Amylase
40. The average energy yield from one gm fat on oxidation is:
Answer: B) 9.3 Kcal
41. The process of breaking down complex molecules is:
Answer: A) Catabolism
42. Metabolic reactions are catalyzed by:
Answer: C) Enzymes
43. The nucleic acid found in cytoplasm:
Answer: B) RNA
44. Peptide linkage is formed between:
Answer: A) -COOH and -NH2 group
45. The process of synthesis of glycogen from glucose:
Answer: B) Glycogenesis
46. Cholesterol is a:
Answer: B) Lipid
47. The vitamin required for blood clotting is:
Answer: C) Vitamin K
48. DNA differs from RNA in:
Answer: C) Both A and B
49. The most abundant mineral in animal body is:
Answer: A) Calcium
50. Non-competitive inhibitor binds to:
Answer: B) Allosteric site
51. Which vitamin is fat-soluble?
Answer: B) K
52. The biuret test is used for:
Answer: C) Protein
53. Molecular chaperones assist in:
Answer: A) Folding proteins
54. The enzyme that hydrolyzes DNA is:
Answer: A) DNase
55. Essential amino acids are those which:
Answer: A) Cannot be synthesized by the body
56. The simplest monosaccharide:
Answer: C) Glyceraldehyde
57. The enzyme present in saliva:
Answer: B) Amylase
58. Sucrose is composed of:
Answer: B) Glucose + fructose
59. The biochemical test for starch uses:
Answer: B) Iodine
60. Bond present in nucleic acids:
Answer: C) Phosphodiester
61. Which component is NOT found in RNA?
Answer: C) Thymine
62. The positive test for proteins is:
Answer: D) Biuret
63. Which of these are reducing sugars?
Answer: B) Glucose
64. The substrate for lipase is:
Answer: A) Fat
65. The optimum temperature for most enzymes is:
Answer: C) 37°C
66. A polysaccharide is:
Answer: C) Glycogen
67. Triglyceride is composed of:
Answer: B) Three fatty acids, one glycerol
68. Which bond is not found in protein molecules?
Answer: C) Glycosidic
69. Haemoglobin is a:
Answer: B) Chromoprotein
70. The monomer of nucleic acids:
Answer: B) Nucleotide
71. Peptide bonds are:
Answer: A) Strong covalent
72. Which fatty acid is unsaturated?
Answer: C) Oleic acid
73. The prosthetic group of hemoglobin is:
Answer: B) Heme
74. Which is not a component of ATP?
Answer: D) Thymine
75. Basic amino acids are:
Answer: A) Lysine
76. Which test is used to detect reducing sugar?
Answer: A) Benedict’s
77. The major phospholipid in membranes is:
Answer: A) Lecithin
78. DNA double helix model was proposed by:
Answer: B) Watson and Crick
79. The coenzyme NAD is derived from:
Answer: A) Niacin
80. The sugar in DNA is:
Answer: B) Deoxyribose
81. Which is a ketose sugar?
Answer: C) Fructose
82. Buffer solutions in body are mainly formed by:
Answer: C) Proteins
83. The average energy yield from 1 gm carbohydrate:
Answer: A) 4.1 Kcal
84. Which vitamin is required for vision?
Answer: A) A
85. Which of the following is a storage protein?
Answer: C) Casein
86. Removing the amino group from an amino acid is called:
Answer: C) Deamination
87. Amylase acts on:
Answer: A) Starch
88. The basic repeating unit of glycogen is:
Answer: B) Glucose
89. NADH is mainly produced in:
Answer: B) Respiration
90. Most enzymes are:
Answer: C) Proteins
91. Which sugar is a component of ATP?
Answer: B) Ribose
92. RNA differs from DNA by:
Answer: A) Uracil instead of Thymine
93. Which is a microelement?
Answer: C) Manganese
94. Double helix structure is shown by:
Answer: B) DNA
95. Which is a water-soluble vitamin?
Answer: D) C
96. Oxidation of 1 gm protein yields (approx):
Answer: D) 4.1 Kcal
97. The isoelectric point is the pH at which:
Answer: B) Zwitterion forms zero net charge
98. The non-protein part of enzyme is:
Answer: B) Coenzyme
99. The vitamin which is antioxidant in nature:
Answer: A) E
100. Which forms the main structural element in plant cell walls?
Answer: B)