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Main function of an enzyme is to

  • A.increase the activation energy
  • B.decrease the activation energy
  • C.maintain constant activation energy
  • D.none of these

Answer: B

Correct answer: decrease the activation energy

An enzyme lowers the activation energy by binding the substrate in a strained arrangement that resembles the transition state, so a far greater fraction of molecules have enough energy to react. What it does not change is the equilibrium or the overall free energy change - it makes the reaction faster, not more favourable, and it speeds both directions equally.

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