An enzyme changes the rate of a reaction without altering its

  • A. activation energy
  • B. speed of completion
  • C. overall energy difference between substrates and products
  • D. reaction pathway

Explanation

Catalysts lower the activation energy and speed the reaction, but the energy of substrates and products is fixed by chemistry, so the enzyme cannot change it. This is why an enzyme never makes an unfavourable reaction favourable.

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