SAT Subject Biology Practice Question 220: Answer and Explanation

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Question: 220

10. Pepsinogen is secreted by the cells lining the stomach. In a low-pH solution, it is converted to an active enzyme, called pepsin. The purpose of producing pepsinogen instead of pepsin is to

A. preserve the active site
B. protect the secreting cells
C. raise the pH of the liquid inside the stomach
D. ensure that the enzyme is active when food is present
E. prevent the enzyme from breaking down carbohydrate

Correct Answer: B


Pepsin is an enzyme that digests protein in the stomach. It is produced by cells as an inactive precursor to avoid damaging the proteins within the cells.

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