MCQs – Biomolecules

1. The basic unit of proteins is:
a) Nucleotides
b) Amino acids
c) Fatty acids
d) Monosaccharides

2. Which of the following is a disaccharide?
a) Glucose
b) Fructose
c) Maltose
d) Galactose

3. The number of chiral carbons in glucose is:
a) 2
b) 3
c) 4
d) 5

4. Which of the following is a reducing sugar?
a) Sucrose
b) Maltose
c) Starch
d) Cellulose

5. Which vitamin is water-soluble?
a) Vitamin A
b) Vitamin D
c) Vitamin K
d) Vitamin C

6. Which of the following is a storage polysaccharide in animals?
a) Starch
b) Glycogen
c) Cellulose
d) Chitin

7. The prosthetic group of haemoglobin is:
a) Chlorophyll
b) Haem
c) Biotin
d) Cyanocobalamin

8. DNA differs from RNA in having:
a) Ribose sugar
b) Thymine instead of uracil
c) Single strand only
d) Guanine

9. The linkage between two amino acids is:
a) Glycosidic bond
b) Peptide bond
c) Hydrogen bond
d) Ester bond

10. Which of the following is a fibrous protein?
a) Hemoglobin
b) Insulin
c) Keratin
d) Albumin

11. In DNA, complementary base pairing occurs between:
a) A–G and C–T
b) A–T and G–C
c) A–C and T–G
d) A–U and G–C

12. The process of conversion of glucose to ethanol by yeast is:
a) Oxidation
b) Fermentation
c) Reduction
d) Hydrolysis

13. The deficiency of Vitamin D causes:
a) Night blindness
b) Rickets
c) Beriberi
d) Scurvy

14. Which of the following carbohydrates is a non-reducing sugar?
a) Glucose
b) Maltose
c) Sucrose
d) Lactose

15. Insulin is a:
a) Steroid
b) Vitamin
c) Protein
d) Carbohydrate

16. The sugar present in RNA is:
a) Deoxyribose
b) Ribose
c) Fructose
d) Glucose

17. The secondary structure of proteins is stabilized by:
a) Hydrogen bonds
b) Ionic bonds
c) Disulfide bonds
d) Peptide bonds

18. The genetic material in most viruses is:
a) DNA only
b) RNA only
c) Both DNA and RNA
d) Protein

19. Which one is a sulphur-containing amino acid?
a) Glycine
b) Serine
c) Cysteine
d) Alanine

20. Starch is composed of:
a) Amylose only
b) Amylopectin only
c) Amylose and amylopectin
d) Glucose and fructose

✅ Answer Key

  1. b
  2. c
  3. c
  4. b
  5. d
  6. b
  7. b
  8. b
  9. b
  10. c
  11. b
  12. b
  13. b
  14. c
  15. c
  16. b
  17. a
  18. b
  19. c
  20. c

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