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 proteins refers to
A) Folding pattern
B) 3D structure
C) Subunit binding
D) Amino acid sequence
✅ Correct Answer: D
Explanation: Primary structure is the linear sequence of amino acids.
Q: Glycolysis occurs in the
A) Cytoplasm
B) Mitochondria
C) Nucleus
D) Golgi body
✅ Correct Answer: A
Explanation: Glycolysis takes place in the cytoplasm of the cell.
Q: Enzyme activity is measured in
A) Meters
B) Units
C) Calories
D) Volts
✅ Correct Answer: B
Explanation: Enzyme units quantify enzymatic activity.
Q: Enzyme function can be inhibited by
A) Vitamins
B) Inhibitors
C) Catalysts
D) Substrates
✅ Correct Answer: B
Explanation: Inhibitors slow down or stop enzyme activity.
Q: RNA is usually
A) Quadruple-stranded
B) Circular
C) Double-stranded
D) Single-stranded
✅ Correct Answer: D
Explanation: RNA typically exists as a single strand.