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: Primary structure of a protein refers to
A) Folding
B) Hydrogen bonding
C) Sequence of amino acids
D) Subunit interaction
✅ Correct Answer: C
Explanation: Primary structure is the unique sequence of amino acids in a polypeptide chain.
Q: Final electron acceptor in the electron transport chain
A) Oxygen
B) Water
C) Carbon dioxide
D) ATP
✅ Correct Answer: A
Explanation: Oxygen accepts electrons and combines with hydrogen to form water.
Q: Major buffer system in human blood
A) Bicarbonate buffer
B) Protein buffer
C) Ammonia buffer
D) Phosphate buffer
✅ Correct Answer: A
Explanation: The bicarbonate buffer system maintains pH balance in the blood.
Q: Type of bond joining amino acids
A) Disulfide bond
B) Hydrogen bond
C) Ionic bond
D) Peptide bond
✅ Correct Answer: D
Explanation: A peptide bond is formed between amino acids during protein synthesis.
Q: Enzyme catalyzing DNA synthesis
A) DNA polymerase
B) RNA polymerase
C) DNA helicase
D) Ligase
✅ Correct Answer: A
Explanation: DNA polymerase adds nucleotides to the growing DNA strand during replication.