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: Enzyme responsible for DNA replication
A) Helicase
B) RNA polymerase
C) DNA polymerase
D) Ligase
✅ Correct Answer: C
Explanation: DNA polymerase adds nucleotides to the growing DNA strand.
Q: Organ responsible for most plasma protein synthesis
A) Spleen
B) Liver
C) Kidney
D) Lung
✅ Correct Answer: B
Explanation: The liver produces the majority of plasma proteins including albumin.
Q: Protein that transports iron in the blood
A) Albumin
B) Transferrin
C) Hemoglobin
D) Ferritin
✅ Correct Answer: B
Explanation: Transferrin binds iron and transports it through the bloodstream.
Q: Metabolic pathway activated during fasting
A) Lipogenesis
B) Glycogenesis
C) Glycolysis
D) Gluconeogenesis
✅ Correct Answer: D
Explanation: Gluconeogenesis generates glucose from non-carbohydrate sources during fasting.
Q: Primary storage form of lipids in adipose tissue
A) Fatty acids
B) Triglycerides
C) Cholesterol
D) Phospholipids
✅ Correct Answer: B
Explanation: Triglycerides are the main energy storage lipids in adipocytes.