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: Enzymes accelerate reactions by lowering
A) Product concentration
B) Substrate level
C) Reaction volume
D) Activation energy
✅ Correct Answer: D
Explanation: Enzymes reduce the activation energy needed for reactions.
Q: Glycolysis takes place in the
A) Mitochondria
B) Cytoplasm
C) Ribosome
D) Nucleus
✅ Correct Answer: B
Explanation: Glycolysis is a cytoplasmic process that breaks down glucose.
Q: Cholesterol is classified as a
A) Protein
B) Lipid
C) Carbohydrate
D) Nucleic acid
✅ Correct Answer: B
Explanation: Cholesterol is a type of lipid involved in membrane structure.
Q: DNA is made up of
A) Fatty acids
B) Amino acids
C) Nucleotides
D) Sugars
✅ Correct Answer: C
Explanation: Nucleotides are the building blocks of DNA.
Q: Enzymes act as
A) Structural units
B) Transport proteins
C) Biological catalysts
D) Immune markers
✅ Correct Answer: C
Explanation: Enzymes speed up biochemical reactions without being consumed.