Question
The optimum pH at which the enzymes pepsin and trypsin of the human alimentary canal works are
NDA
General Ability
General Science
2025
NDA 2025 (Phase 2)
NDA General Ability Question (2025) — Solution
Options
- A. pH 2·0 and 7·9, respectively
- B. pH 4·5 and 3·5, respectively
- C. pH 9·5 and 4·5, respectively
- D. pH 7·0 and 8·0, respectively
Answer
A. pH 2·0 and 7·9, respectively
Step-by-step solution
Pepsin is a proteolytic enzyme secreted in the stomach, which requires a highly acidic medium for its optimal activity. The optimum pH for pepsin is around 1 8 to 2 0. Trypsin is a proteolytic enzyme secreted by the pancreas into the small intestine, which requires a slightly alkaline medium for its optimal activity. The optimum pH for trypsin is around 7 8 to 8 0. Therefore, the optimum pH values for pepsin and trypsin are approximately 2 0 and 7 9, respectively. Answer: pH 2·0 and 7·9, respectively
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