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Blocking of enzyme action by blocking its active sites is

  • A.feedback inhibition
  • B.allosteric inhibition
  • C.competitive inhibition
  • D.non-competitive inhibition

Answer: C

Correct answer: competitive inhibition

A competitive inhibitor resembles the substrate closely enough to occupy the active site, so the two compete for it. The effect can therefore be overcome by raising the substrate concentration - which is what raises the apparent \(K_m\) while leaving \(V_{max}\) unchanged. Allosteric and non-competitive inhibitors bind elsewhere.

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