Organic Chemistry Practice Questions with Answers (Set 15)

 

1. Which of the following will cause the rate of enzyme activity to increase linearly?

a. increasing the enzyme concentration
b. increasing the substrate concentration
c. increasing the temperature
d. increasing the pH

2. Which of the following will the cause the rate of enzyme activity to first increase and then level
off?

a. increasing the enzyme concentration
b. increasing the substrate concentration
c. increasing the temperature
d. increasing the pH

3. Which of the following can cause enzyme activity to either increase or decrease?

a. changing the temperature
c. both a and b
b. changing the pH
d. neither a nor b

4. Which of the following can cause enzyme activity to either increase or decrease?

a. increasing the substrate concentration
b. changing the pH
c. both a and b
d. neither a nor b

5. In which type of inhibition is it possible to restore the maximum rate of enzyme activity by
adding additional substrate?

a. cooperative inhibition
c. noncompetitive inhibition
b. competitive inhibition
d. selective inhibition

6. In which type of inhibition is it not possible to restore the maximum rate of enzyme activity by
adding additional substrate?

a. cooperative inhibition
c. noncompetitive inhibition
b. competitive inhibition
d. selective inhibition

7. Which of the following is often true of the active site of an enzyme?

a. It consists of amino acids near both the N-terminus and C-terminus.
b. It consists of amino acids which are adjacent to each other.
c. It consists of amino acids which not adjacent to each other.
d. None of the above is true.

8. Consider the following reaction. Which classification would be correct for the enzyme that catalyzes this reaction?


a. oxidoreductase
b. isomerase
c. transferase
d. ligase
e. hydrolase

9. Consider the following image depicting enzyme behavior. Which of the following correctly characterizes the components of this model?


a. A – enzyme, B – substrate, C – active site, D – E-S complex
b. A – substrate, B – active site, C – enzyme, D – E-S complex
c. A – active site, B – substrate, C – E-S complex, D – enzyme
d. A – substrate, B – enzyme, D – E-S complex, D – active site

10. Examine the following graph. Which of the following explains why the “line” on the graph does not continue in a linear  fashion?


a. All of the added substrate is bound to the enzyme.
b. All of the enzyme active sites are occupied.
c. The amount of enzyme present is greater than needed by the substrate.
d. An inhibitor is present.

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