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: Macromolecule primarily responsible for catalyzing reactions
A) Nucleic acids
B) Proteins
C) Lipids
D) Carbohydrates
✅ Correct Answer: B
Explanation: Proteins function as enzymes, speeding up biochemical reactions.
Q: Site of cholesterol synthesis in the cell
A) Ribosome
B) Mitochondria
C) Smooth endoplasmic reticulum
D) Nucleus
✅ Correct Answer: C
Explanation: Smooth ER contains the enzymes necessary for cholesterol biosynthesis.
Q: Type of enzyme that transfers a phosphate group
A) Ligase
B) Kinase
C) Isomerase
D) Hydrolase
✅ Correct Answer: B
Explanation: Kinases are enzymes that catalyze the transfer of phosphate groups.
Q: Biomolecule serving as the genetic code translator
A) RNA polymerase
B) DNA
C) mRNA
D) ATP
✅ Correct Answer: C
Explanation: mRNA carries genetic instructions from DNA to the ribosome for protein synthesis.
Q: Biochemical process producing urea
A) Gluconeogenesis
B) Urea cycle
C) Glycolysis
D) Photosynthesis
✅ Correct Answer: B
Explanation: Urea is formed in the liver through the urea cycle to eliminate excess nitrogen.