Biology 100 Quiz 2 Chapter 4, 11 Questions and
Answers
Q: What might lead to a protein that does not function properly?
A. The active site becoming distorted
B. The active site becoming blocked
C. Incorrect folding of the amino acid chain
D. All of these
✓✓ D. All of those
Q: Organic molecules that end in the suffix "-ase" often function as
________ molecules.
A. transport
B. storage
C. enzymatic
D. structural
✓✓ C. Enzymatic
Q: Which statement is true of enzymes?
A. Enzymes can be either proteins or RNA molecules.
B. When a cell makes an enzyme, it makes many copies.
,C. Their substrate specificity involves matching of shapes.
D. Both (a) and (b).
E. (a), (b), and (c).
✓✓ E. Enzymes do all of these things
Q: What's false?
(1) Enzymes may change shape when they bind substrates;
(2) Enzymes provide no energy for the reaction, except collision energy;
(3) Enzymes may release substrates.
A. None of the statements is false.
B. Statement 1 is false.
C. Statement 2 is false.
D. Statement 3 is false.
E. All three statements are false.
✓✓ A. None of the statements is false.
Q: How can "induced fit" influence the specificity of an enzyme?
A. It can not influence the specificity of an enzyme.
B. It moves the reactive portion of the enzyme closer to the substrate.
C. The enzyme's active site changes shape to fit the correct substrate but
not other molecules.
D. Both (b) and (c).
E. None of the above.
, ✓✓ D. Both (b) and (c).
Q: Enzymes speed reactions mainly by ...
A. providing activation energy.
B. protecting the catalysts.
C. lowering EA.
D. raising the kinetic energy of the reactants.
E. None of the above.
✓✓ C. Lowering EA.
Q: Which fact is most important in explaining how enzymes speed
reactions?
A. It takes less energy to break a hydrogen bond than a covalent bond.
B. Very low potential energy tends to make molecules unstable.
C. Large molecules collide more energetically than small molecules.
D. Every reaction step adds to the time required for the overall reaction.
E. High-energy collisions are less common than low-energy collisions.
✓✓ E. High-energy collisions are less common than low-energy collisions.
Q: In an experiment with an enzyme, the 58th amino acid seems to form
a covalent bond with a substrate molecule as part of the catalytic process.
What would you say?
Answers
Q: What might lead to a protein that does not function properly?
A. The active site becoming distorted
B. The active site becoming blocked
C. Incorrect folding of the amino acid chain
D. All of these
✓✓ D. All of those
Q: Organic molecules that end in the suffix "-ase" often function as
________ molecules.
A. transport
B. storage
C. enzymatic
D. structural
✓✓ C. Enzymatic
Q: Which statement is true of enzymes?
A. Enzymes can be either proteins or RNA molecules.
B. When a cell makes an enzyme, it makes many copies.
,C. Their substrate specificity involves matching of shapes.
D. Both (a) and (b).
E. (a), (b), and (c).
✓✓ E. Enzymes do all of these things
Q: What's false?
(1) Enzymes may change shape when they bind substrates;
(2) Enzymes provide no energy for the reaction, except collision energy;
(3) Enzymes may release substrates.
A. None of the statements is false.
B. Statement 1 is false.
C. Statement 2 is false.
D. Statement 3 is false.
E. All three statements are false.
✓✓ A. None of the statements is false.
Q: How can "induced fit" influence the specificity of an enzyme?
A. It can not influence the specificity of an enzyme.
B. It moves the reactive portion of the enzyme closer to the substrate.
C. The enzyme's active site changes shape to fit the correct substrate but
not other molecules.
D. Both (b) and (c).
E. None of the above.
, ✓✓ D. Both (b) and (c).
Q: Enzymes speed reactions mainly by ...
A. providing activation energy.
B. protecting the catalysts.
C. lowering EA.
D. raising the kinetic energy of the reactants.
E. None of the above.
✓✓ C. Lowering EA.
Q: Which fact is most important in explaining how enzymes speed
reactions?
A. It takes less energy to break a hydrogen bond than a covalent bond.
B. Very low potential energy tends to make molecules unstable.
C. Large molecules collide more energetically than small molecules.
D. Every reaction step adds to the time required for the overall reaction.
E. High-energy collisions are less common than low-energy collisions.
✓✓ E. High-energy collisions are less common than low-energy collisions.
Q: In an experiment with an enzyme, the 58th amino acid seems to form
a covalent bond with a substrate molecule as part of the catalytic process.
What would you say?
