Note from the author:
A review assignment examining the role of ATP as the energy currency of living systems and the function and control of enzymes.
Figure 6.14 The sodium-potassium pump is an example of energy coupling. The energy derived from exergonic
ATP hydrolysis is used to pump sodium and potassium ions across the cell membrane.
3
1
The energy released by the hydrolysis of ATP is
a. primarily stored between the alpha and beta
phosphates
b. equal to −57 kcal/mol
c. harnessed as heat energy by the cell to perform
work
d. providing energy to coupled reactions
4
1
Which of the following molecules is likely to have the
most potential energy?
a. sucrose
b. ATP
c. glucose
d. ADP
5
1
Which of the following is not true about enzymes:
a. They increase ΔG of reactions
b. They are usually made of amino acids
c. They lower the activation energy of chemical
reactions
d. Each one is specific to the particular substrate(s)
to which it binds
6
1
An allosteric inhibitor does which of the following?
a. Binds to an enzyme away from the active site
and changes the conformation of the active site,
increasing its affinity for substrate binding
b. Binds to the active site and blocks it from
binding substrate
c. Binds to an enzyme away from the active site
and changes the conformation of the active site,
decreasing its affinity for the substrate
d. Binds directly to the active site and mimics the
substrate
7
1
Which of the following analogies best describe the
induced-fit model of enzyme-substrate binding?
a. A hug between two people
b. A key fitting into a lock
c. A square peg fitting through the square hole and
a round peg fitting through the round hole of a
children’s toy
d. The fitting together of two jigsaw puzzle pieces.
10
1
Summaries the first two laws of thermodynamics and explain how they relate to living systems.
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