The two chemicals in gastric juices

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Prepare for the VCE Biology Unit 1 AOS 1 Test with flashcards and multiple choice questions. Understand key concepts and receive question explanations. Ace your exam!

Multiple Choice

The two chemicals in gastric juices

Explanation:
Gastric juice is intended to start protein digestion and create the right acidic environment. The two chemicals involved are hydrochloric acid and pepsin. Hydrochloric acid lowers the stomach pH and activates pepsin from its inactive precursor, pepsinogen. Once active, pepsin begins breaking down protein by cleaving peptide bonds. The other substances listed aren’t typical components of gastric juice—they’re associated with digestion elsewhere (amylase and lipase mainly act on carbohydrates and fats in the mouth or small intestine; bile aids fat emulsification in the small intestine; trypsin is a pancreatic enzyme; nucleases aren’t a standard part of gastric juice).

Gastric juice is intended to start protein digestion and create the right acidic environment. The two chemicals involved are hydrochloric acid and pepsin. Hydrochloric acid lowers the stomach pH and activates pepsin from its inactive precursor, pepsinogen. Once active, pepsin begins breaking down protein by cleaving peptide bonds. The other substances listed aren’t typical components of gastric juice—they’re associated with digestion elsewhere (amylase and lipase mainly act on carbohydrates and fats in the mouth or small intestine; bile aids fat emulsification in the small intestine; trypsin is a pancreatic enzyme; nucleases aren’t a standard part of gastric juice).

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