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: The building blocks of proteins are
A) Fatty acids
B) Amino acids
C) Monosaccharides
D) Nucleotides
✅ Correct Answer: B
Explanation: Proteins are polymers of amino acids.
Q: Most enzymes function best at
A) High salt
B) Acidic conditions
C) Optimal pH and temperature
D) Low pH
✅ Correct Answer: C
Explanation: Each enzyme works best within a specific pH and temperature range.
Q: The active site of an enzyme binds
A) Any molecule
B) Specific substrate
C) Water
D) All proteins
✅ Correct Answer: B
Explanation: Enzymes are substrate-specific due to their active site structure.
Q: Chylomicrons primarily transport
A) Lipids
B) Glucose
C) Ions
D) Nucleic acids
✅ Correct Answer: A
Explanation: Chylomicrons carry lipids through the lymphatic and circulatory systems.
Q: Gluconeogenesis synthesizes glucose from
A) Fatty acids
B) Carbohydrates
C) Non-carbohydrates
D) Proteins
✅ Correct Answer: C
Explanation: Gluconeogenesis forms glucose from non-carbohydrate sources like lactate or amino acids.