Enzymes Quiz
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5 questions, one answer each
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1. What does a catalyst such as an enzyme do?
- A. Increases the energy of substrate molecules
- B. Lowers the activation energy
- C. Is used up in the reaction
- D. Supplies ATP
2. Which determines the shape of an enzyme's active site?
- A. Its tertiary structure
- B. The temperature only
- C. Its peptide bonds
- D. The substrate
3. An enzyme is heated above its optimum. What is the main effect?
- A. Its peptide bonds break and it becomes smaller
- B. It is denatured as the bonds holding its tertiary structure break
- C. Its substrate is used up
- D. Its activation energy increases
4. At a high substrate concentration the rate no longer increases. Why?
- A. The enzyme is denatured
- B. The substrate becomes a product
- C. All the active sites are occupied
- D. The pH has changed
5. Which enzyme works outside the cell that made it?
- A. Trypsin
- B. Catalase
- C. DNA polymerase
- D. ATP synthase