Which one of the following graphs shows how the rate of reaction of pepsin is affected by pH?
Correct answer: D. Graph D
- A. Graph A
- B. Graph B
- C. Graph C
- D. Graph D
Explanation
Every enzyme works best at its optimum pH. Pepsin's optimum pH is 2. Graph D shows the correct optimal pH peak near pH 2, and it is the correct option. Other options shows optimal pH peak at different pH other than 2.
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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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