Biochemistry Practice MCQs Flashcards

Biochemistry Practice MCQs

Citric Acid Cycle

  • Question 1: What is the first molecule formed in the citric acid cycle?

    • A. Citrate
    • B. Isocitrate
    • C. Malate
    • D. Succinate
    • Answer: A. Citrate

  • Question 2: Which enzyme catalyzes the conversion of citrate to isocitrate?

    • A. Aconitase
    • B. Citrate synthase
    • C. Isocitrate dehydrogenase
    • D. Fumarase
    • Answer: A. Aconitase

Cori Cycle

  • Question 3: What is the main purpose of the Cori cycle?
    • A. Recycle lactate to glucose in the liver
    • B. Generate ATP in muscle
    • C. Convert glucose to acetyl-CoA
    • D. Produce ketone bodies in the liver
    • Answer: A. Recycle lactate to glucose in the liver

Glycolysis

  • Question 4: Where does glycolysis occur?

    • A. Cytoplasm
    • B. Mitochondrial matrix
    • C. Nucleus
    • D. Inner mitochondrial membrane
    • Answer: A. Cytoplasm

  • Question 5: Which glycolytic or related step produces NADPH?

    • A. Glucose-6-phosphate dehydrogenase reaction in the PPP
    • B. GAPDH reaction
    • C. Pyruvate kinase
    • D. Phosphoglycerate kinase
    • Answer: A. Glucose-6-phosphate dehydrogenase reaction in the PPP