Chemical Digestion Quiz
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5 questions, one answer each
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1. What does chemical digestion involve?
- A. Breaking food into smaller pieces with no chemical change
- B. Breaking large insoluble molecules into small soluble molecules using enzymes
- C. Absorbing nutrients into the blood
- D. Removing undigested food from the body
2. Which enzyme breaks down starch?
- A. Protease
- B. Lipase
- C. Amylase
- D. Maltase
3. What are the two functions of hydrochloric acid in the stomach?
- A. Emulsifying fat and absorbing nutrients
- B. Killing microorganisms and providing optimum pH for pepsin
- C. Neutralising bile and breaking down starch
- D. Producing mucus and lubricating food
4. Where does trypsin act, and under what conditions?
- A. In the stomach, in acidic conditions
- B. In the small intestine, in alkaline conditions
- C. In the mouth, in neutral conditions
- D. In the liver, in acidic conditions
5. A student finds that adding bile to a test tube of food and gastric juice raises its pH from 2 to 8. Explain why this matters for digestion.
- A. It kills all remaining enzymes so digestion stops
- B. It provides the optimum alkaline pH needed for small intestine enzymes like trypsin to work
- C. It converts starch directly into glucose
- D. It has no effect on chemical digestion