WAEC Biology 2021 Objective — Question 22
Question 22 of 50 from the West African Examinations Council (WAEC) Biology 2021 Objective paper, with the correct answer and a full explanation.
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22. An enzyme reaction may begin to decline when
- A. the optimum temperature is attained.
- B. the pH of the medium is altered.Correct
- C. there is an increase in substrate concentration.
- D. the atmospheric pressure is altered.
Explanation
Enzymes are sensitive to pH; a change away from the optimum pH can denature or reduce enzyme activity, slowing the reaction.
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