Which one of the following graphs shows how the rate of reaction of pepsin is affected by pH?
Correct answer: D. D
- A. A
- B. B
- C. C
- D. D
Explanation
Every enzyme work best at its optimum pH. Pepsin optimum pH is 2. In the pH above 2 pepsin will be denatured.
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Enzymes are biological catalysts that lower activation energy without being consumed, and their specificity is explained by the lock and key and induced fit models. Work includes the effects of temperature, pH and substrate concentration on reaction rate, plus competitive and non-competitive inhibition and how these differ.
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