Which of these enzymes works best at a pH of 2.00?
Correct answer: C. Pepsin
- A. Sucrase
- B. Salivary enzymes
- C. Pepsin
- D. Enterokinase
Explanation
Pepsin is a digestive enzyme secreted by the stomach to help break down proteins. It works best in highly acidic conditions, with an optimal pH of around 2.00. The stomach provides this environment, as its pH typically ranges from 1.5 to 2.5. This low pH allows pepsin to function effectively and carry out its role in protein digestion.
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About Enzymes
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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