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: End product of aerobic glycolysis
A) Acetyl-CoA
B) Ethanol
C) Pyruvate
D) Lactic acid
✅ Correct Answer: C
Explanation: Pyruvate is the product of glycolysis when oxygen is available.
Q: Component not found in RNA
A) Thymine
B) Ribose
C) Phosphate
D) Uracil
✅ Correct Answer: A
Explanation: RNA contains uracil instead of thymine found in DNA.
Q: Lipid-soluble vitamin important for vision
A) Vitamin K
B) Vitamin C
C) Vitamin D
D) Vitamin A
✅ Correct Answer: D
Explanation: Vitamin A is essential for the synthesis of rhodopsin in the retina.
Q: Enzyme class that removes water during a reaction
A) Lyase
B) Isomerase
C) Hydrolase
D) Oxidoreductase
✅ Correct Answer: A
Explanation: Lyases catalyze reactions involving removal of groups without hydrolysis, often forming double bonds.
Q: Biochemical molecule classified as a coenzyme
A) NAD+
B) Insulin
C) ATP
D) DNA
✅ Correct Answer: A
Explanation: NAD+ acts as a coenzyme in redox reactions by accepting electrons.