Download A change in temperature affects an enzymatic reaction because

1.
a.
b.
c.
d.
A change in temperature affects an enzymatic reaction because _____.
the active site of the enzyme becomes rapidly oxidized
the enzyme forms bonds with itself instead of the substrate
the active site of the enzyme no longer interacts properly with the substrate
the enzyme forms abnormal bonds with the substrate
2. The molecule that an enzyme acts upon is known as its
a. coenzyme.
c. catalyst.
b. holoenzyme.
D. substrate.
3.
a.
b.
c.
d.
Which of the following statements concerning enzymes is FALSE?
They can be denatured if the pH of their environment is too high or too low.
They can be used to catalyze a chemical reaction over and over again.
They can be complete or apoenzymes
They all function best at 37°C.
4. Sulfanilamide is an antimicrobial drug that mimics the shape of an important substrate for a particular
bacterial enzyme, thereby inhibiting the enzyme. This type of inhibition is known as
a. excitatory allosteric control
c. Feedback inhibition.
b. competitive inhibition.
d. allosteric inhibition.
For the following questions (5-8), indicate the type of metabolism referred to by selecting:
a. Anabolism only
b. Catabolism only
c. Both anabolism and catabolism
5.
6.
7.
8.
Breaks larger molecules into smaller ones which generates ATP
Includes dehydration synthesis reactions which uses ATP
Involves the production of cell wall components
Includes the whole process of metabolism
9. Which of the following would not affect the function of an enzyme?
a. Substrate concentration
c. Competitive inhibitor
b. Temperature
d. Solvent concentration
10. Which of the following graphs would show the relationship between an enzymes reaction rate and the
concentration of coenzyme needed by the enzyme? (Assuming enzyme concentration is constant).
11. Which of the following graphs would show the relationship between an enzymes reaction rate and the
temperature for an enzyme?
12. The graph below shows lipase activity, which is made in the pancreas and active in the small intestine, and
pepsin activity, which works in the stomach.
13. What is the optimum pH for the enzyme lipase based on the information below?
a. pH 1.5
c. pH 8
b. pH 5
d. pH 12
14. Which of the following statements is true regarding the graph below?
a. The extreme temperature causes the denaturation of the enzyme. Therefore the reaction rate stays the
same.
b. The enzyme’s reaction rate will increase until the saturation point is reached, regardless of the substrate
concentration.
c. Increasing the substrate concentration will continually increase the reaction rate.
d. Decreasing the substrate concentration will cause an increase in the reaction rate.
15. Thernus aquaticus is a bacterium that lives in hot springs where temperatures exceed 70 ⁰C. How would the
line in the graph above change to represent the optimum temperature of the catalase enzyme in the
bacteria?
a.
b.
c.
d.
The line graph would shift to the right
The line graph would shift to the left
The line graph would stay the same
The line graph would shift up and become more narrow
16. Which of the following statements is true regarding the picture below?
a.
b.
c.
d.
The square molecule is activing as a competitive inhibitor
The square molecule is acting as an allosteric inhibitor
The substrate will bond to the allosteric site
The end product of the reaction will stop the enzyme from working
Identify the following components with the choices below.
a. Substrate
b. Allosteric Site
c. Active Site
d. Enzyme
e. Allosteric Inhibitor
22. Escherichia coli must synthesize the amino acid isoleucine for its metabolic needs. In the chemical pathway that
makes isoleucine, the abundance of the amino acid will prevent more isoleucine from being made. What type of
inhibition is illustrated by this example?
a. Competitive inhibition
b. Excitatory allosteric control
b. Inhibitory allosteric control
d. Feedback inhibition