BIO NMDCAT Factors that Affect the Rate of Enzyme Reactions

nmdcat.online July 11, 2026

During digestion in the human stomach, pepsin remains highly active because

A. Gastric juice maintains an acidic environment near its optimum pH

✓

B. Pepsin functions best in alkaline medium

C. Pepsin is unaffected by pH changes

D. Hydrochloric acid increases enzyme concentration

📝 Explanation

Pepsin functions optimally around pH 2 due to the highly acidic conditions of the stomach.

📖 Additional Information

Gastric juice maintains an acidic environment near its optimum pH
Pepsin functions best in alkaline medium
Pepsin is unaffected by pH changes
Hydrochloric acid increases enzyme concentration

Pepsin functions optimally around pH 2 due to the highly acidic conditions of the stomach.

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