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WAEC Biology 2021 Question 22

Question 22

Food Substances and Enzymes

An enzyme reaction may begin to decline when

  1. A.the optimum temperature is attained.
  2. B.the pH of the medium is altered.
  3. C.there is an increase in substrate concentration.
  4. D.the atmospheric pressure is altered.
Show the answer and explanation

Answer: B (the pH of the medium is altered.)

Explanation

Each enzyme works best at a particular pH; changing the pH alters its shape and slows the reaction.