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Why are regulatory enzymes needed?

  • A.Control the enzymatic activity
  • B.Regulate the enzyme synthesis
  • C.Both
  • D.None

Answer: C

Correct answer: Both

Regulation operates at two levels, and both are needed. Activity control - allosteric effects, phosphorylation - adjusts existing enzymes within seconds. Control of synthesis - induction and repression - changes how much enzyme there is at all, over a much longer period. Fast control handles moment-to-moment demand; slow control matches the cell’s enzyme complement to its circumstances.

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