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Uncatalyzed reaction shows ______________ activation energy

  • A.Lower
  • B.Higher
  • C.Moderate
  • D.Optimum

Answer: B

Correct answer: Higher

An uncatalysed reaction must surmount the full activation energy barrier, so only the small fraction of molecules with enough energy react and the rate is low. An enzyme lowers that barrier by stabilising the transition state, which is exactly how it speeds the reaction up.

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