Q1. [1] straightforward initial-understanding
Which enzyme present in the gastric juice digests proteins in the stomach?
- A Amylase
- B Pepsin
- C Lipase
- D Trypsin
Generated by claude-sonnet-4-6 · 2026-06-10 02:56 · grounding rag
Model Answer
Answer: B — Pepsin
The gastric glands in the stomach wall release a protein-digesting enzyme called pepsin. Hydrochloric acid creates an acidic medium which facilitates the action of pepsin.
Source: Life Processes, Section 5.2.4
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Explanation
- Pepsin is the only enzyme in gastric juice that digests proteins.
- Amylase digests starch (found in saliva/pancreatic juice); Lipase digests fats (pancreatic juice); Trypsin digests proteins but is secreted by the pancreas, not the stomach.
- The key phrase from the textbook: "a protein digesting enzyme called pepsin" — memorise this directly.