Enzymes Quiz
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5 questions, one answer each
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1. What effect does an enzyme have on activation energy?
- A. It raises it
- B. It lowers it
- C. It removes it
- D. It has no effect
2. Why is an enzyme specific to its substrate?
- A. Its active site has a complementary shape
- B. It is a small molecule
- C. It has no tertiary structure
- D. It is used up in the reaction
3. Which enzyme is extracellular?
- A. Catalase in liver cells
- B. A respiratory enzyme in a mitochondrion
- C. Trypsin in the small intestine
- D. An enzyme in the cytoplasm of a red blood cell
4. A reaction produces 24 cm³ of gas in the first 40 s. What is the mean rate?
- A. 1.67 cm³ s⁻¹
- B. 0.60 cm³ s⁻¹
- C. 0.40 cm³ s⁻¹
- D. 1.60 cm³ s⁻¹
5. Substrate concentration is raised until the rate stops increasing. Why?
- A. The enzyme is denatured
- B. The activation energy rises
- C. The substrate becomes less reactive
- D. All the active sites are occupied