Multiple choice

In which of the following mediums is pepsin active?

  1. Acid

  2. Alkaline

  3. Neutral

  4. Isotonic

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pepsin is a protease (protein-digesting enzyme) that functions optimally in acidic conditions (pH 1.5-2). The stomach's hydrochloric acid provides this acidic environment and also converts pepsinogen to active pepsin. In alkaline, neutral, or isotonic conditions, pepsin becomes denatured or inactive. Option A correctly states pepsin is active in acid. Pepsin would be inactive in alkaline (B), neutral (C), or isotonic (D) environments.

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