Biochemistry MCQs
Biochemistry MCQs cover enzymes, metabolism, vitamins, nucleic acids, and clinical correlations. Perfect for MDCAT, USMLE, FCPS, and competitive exams, these quizzes strengthen molecular biology concepts and link biochemical processes to human health and disease.
Q: Denaturation affects a protein's
A) Molecular weight
B) Folding and shape
C) Genetic code
D) Primary structure
✅ Correct Answer: B
Explanation: Denaturation disrupts the secondary and tertiary structures.
Q: ATP is composed of
A) Thymine and phosphate
B) Glucose and ribose
C) Adenine, ribose, and phosphate
D) Ribose and uracil
✅ Correct Answer: C
Explanation: ATP consists of adenine, ribose sugar, and three phosphate groups.
Q: Water is essential in biochemistry due to its
A) Hydrophobic nature
B) High acidity
C) Solvent properties
D) Insolubility
✅ Correct Answer: C
Explanation: Water dissolves many biomolecules, facilitating biochemical reactions.
Q: Disaccharides are formed by
A) Sublimation
B) Oxidation
C) Condensation
D) Hydrolysis
✅ Correct Answer: C
Explanation: Disaccharides form through a condensation reaction between two monosaccharides.
Q: Most abundant protein in the human body is
A) Actin
B) Collagen
C) Hemoglobin
D) Insulin
✅ Correct Answer: B
Explanation: Collagen provides structural support in connective tissues.