Biological Molecules Quiz
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5 questions, one answer each
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1. Which elements are found in lipids?
- A. Carbon, hydrogen, oxygen and nitrogen
- B. Carbon, hydrogen and oxygen
- C. Nitrogen and sulfur only
- D. Carbon and nitrogen only
2. Which test would show a blue-black colour change if starch is present?
- A. Benedict's test
- B. Biuret test
- C. Iodine test
- D. Emulsion test
3. What does an enzyme's active site do?
- A. Stores energy for the reaction
- B. Provides the shape that binds a specific substrate
- C. Breaks down the enzyme after use
- D. Changes the enzyme into a different protein
4. A student heats an enzyme well above its optimum temperature and finds the reaction stops completely. What has happened?
- A. The enzyme has been used up
- B. The enzyme has denatured, so the substrate no longer fits the active site
- C. The substrate has evaporated
- D. The enzyme has become a carbohydrate
5. A student tests four unknown food samples and one shows a cloudy white colour when shaken with ethanol and then water. What does this indicate?
- A. The sample contains starch
- B. The sample contains protein
- C. The sample contains fat
- D. The sample contains glucose