Enzymes Quiz
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5 questions, one answer each
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1. Which part of an enzyme determines the shape of its active site?
- A. Its tertiary structure
- B. Its substrate
- C. Its optimum pH only
- D. Its activation energy
2. In the induced fit hypothesis, what happens when the substrate binds?
- A. The substrate changes into the enzyme
- B. The active site changes shape slightly to fit the substrate more closely
- C. The enzyme is used up
- D. The activation energy increases
3. The rate of a reaction with excess substrate is doubled when the enzyme concentration is doubled. Why?
- A. The substrate is more concentrated
- B. Activation energy doubles
- C. There are twice as many active sites available
- D. The enzyme is no longer specific
4. An inhibitor reduces the maximum rate of a reaction and extra substrate does not restore it. It is most likely to be
- A. a competitive inhibitor
- B. a non-competitive inhibitor
- C. a coenzyme
- D. a buffer
5. An end-product inhibits the first enzyme of its own pathway. What is the benefit to the cell?
- A. The enzyme is permanently denatured
- B. Substrate is converted faster
- C. Production stops when enough end product is present, saving substrate and energy
- D. The end product binds to the active site as a substrate