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Biochemistry: Core Concepts MCQs

Waraq MBBS Review: Biochemistry · MBBS / Medicine · 15 practice questions

1. What is the rate-limiting enzyme of glycolysis?

  1. AHexokinase
  2. BPyruvate kinase
  3. CPhosphofructokinase-1
  4. DAldolase
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C. Phosphofructokinase-1 PFK-1 is the main regulatory step of glycolysis.

2. Which amino acid is the precursor of serotonin?

  1. AGlycine
  2. BTryptophan
  3. CTyrosine
  4. DHistidine
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B. Tryptophan Tryptophan is converted to 5-hydroxytryptophan and then serotonin.

3. Gluconeogenesis occurs mainly in the:

  1. ARed blood cells
  2. BBrain
  3. CSkeletal muscle
  4. DLiver
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D. Liver The liver, and to a lesser extent the kidney, makes glucose from non-carbohydrate sources.

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