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GATE 2020 BT – Question 49

General Biology · Biochemistry: Enzymes, classification, catalytic and regulatory strategies, Michaelis-Menten kinetics and inhibition · 2 marks · Multiple choice

Which strategies do cells use for metabolic regulation? [P] Phosphorylation–dephosphorylation; [Q] allostery; [R] feedback inhibition.

  1. P and Q only
  2. P and R only
  3. Q and R only
  4. P, Q and R

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Show answer and explanation

Correct answer: (D) P, Q and R

Explanation

Reversible phosphorylation changes enzyme activity through covalent modification. Allosteric effectors alter activity by binding regulatory sites. Feedback inhibition allows a downstream product to reduce an earlier pathway step. Each is a recognized regulatory strategy, so P, Q and R are all correct, D.

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