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GATE 2026 BT – Question 16

General Biology · Biochemistry: Metabolism of carbohydrates, lipids, amino acids and nucleic acids, glycolysis, citric acid cycle, fatty acid oxidation, photosynthesis, respiration and electron transport · 1 mark · Multiple choice

Which of the following enzyme is involved in the protection of cells from reactive oxygen species?

  1. Hexokinase
  2. Glucose 6-phosphate dehydrogenase
  3. Enolase
  4. Pyruvate kinase

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Correct answer: (B) Glucose 6-phosphate dehydrogenase

Explanation

Glucose 6-phosphate dehydrogenase starts the pentose phosphate pathway, which produces NADPH. NADPH keeps glutathione reduced, which detoxifies reactive oxygen species. The other enzymes belong to glycolysis.