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: Byproduct of anaerobic glycolysis in yeast
A) Citrate
B) Ethanol
C) Acetyl-CoA
D) Lactic acid
✅ Correct Answer: B
Explanation: Yeast converts pyruvate into ethanol under anaerobic conditions.
Q: Protein hormone regulating glucose metabolism
A) Glucagon
B) Thyroxine
C) Insulin
D) Cortisol
✅ Correct Answer: C
Explanation: Insulin lowers blood glucose by promoting its uptake and storage.
Q: Cofactor necessary for collagen synthesis
A) Vitamin C
B) Calcium
C) Iron
D) Zinc
✅ Correct Answer: A
Explanation: Vitamin C is required for hydroxylation of proline and lysine in collagen.
Q: End product of purine degradation
A) Allantoin
B) Uric acid
C) Urea
D) Ammonia
✅ Correct Answer: B
Explanation: Purine bases are ultimately degraded to uric acid.
Q: Type of RNA that brings amino acids during translation
A) tRNA
B) snRNA
C) mRNA
D) rRNA
✅ Correct Answer: A
Explanation: tRNA carries specific amino acids to the ribosome for protein assembly.