BIO NMDCAT BIOLOGICAL MOLECULES

nmdcat.online June 27, 2026

The optimum pH for the enzyme pepsin, which functions in the stomach, is expected to be around

A. 7.4

B. 8.5

C. 2.0

✓

D. 6.8

📝 Explanation

Pepsin is a gastric enzyme that has adapted to function in the highly acidic environment of the stomach, where HCl is present. Therefore, its optimum pH is strongly acidic (around 1.5-2.0), unlike enzymes like trypsin which function in the alkaline small intestine (pH ~8.0).

📖 Additional Information

7.4
8.5
2.0
6.8

Pepsin is a gastric enzyme that has adapted to function in the highly acidic environment of the stomach, where HCl is present. Therefore, its optimum pH is strongly acidic (around 1.5-2.0), unlike enzymes like trypsin which function in the alkaline small intestine (pH ~8.0).

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