BIOLOGY 100 QUIZ 2 CHAPTER 4, 11 UPDATED QUESTIONS AND
ANSWERS
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 - CORRECT ANSWER✅✅✅D. All of those
Organic molecules that end in the suffix "-ase" often function as ________ molecules.
A. transport
B. storage
C. enzymatic
D. structural - CORRECT ANSWER✅✅✅C. Enzymatic
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). - CORRECT ANSWER✅✅✅E. Enzymes do all of these things
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. - CORRECT ANSWER✅✅✅A. None of the statements is false.
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. - CORRECT ANSWER✅✅✅D. Both (b) and (c).
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. - CORRECT ANSWER✅✅✅C. Lowering EA.
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. - CORRECT ANSWER✅✅✅E.
High-energy collisions are less common than low-energy collisions.
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?
A. This is probably a case where the enzyme changes the position of equilibrium.
B. It couldn't happen. Catalysis doesn't alter the enzyme.
C. There must be an error. Enzymes don't make covalent bonds with substrates.
D. At some point the bond between the amino acid and the substrate must break.
E. This is possible in theory, but it's never been observed. - CORRECT ANSWER✅✅✅D. At some point
the bond between the amino acid and the substrate must break.
What will be accomplished by lowering the activation energy of a reaction?
A. The reaction will reverse.
B. The reaction will proceed more quickly.
C. The reaction will stop completely.
D. The reaction will proceed more slowly. - CORRECT ANSWER✅✅✅B. The reaction will proceed
more quickly.
Water behind a dam has a certain amount of stored energy that can be released as the water falls over
the top of the dam. It may be enough energy to turn a mill wheel or an electricity-generating turbine.
Choose the term that best describes the type of energy stored in the water at the top of the dam.
A. Radiant
B. Kinetic
C. Potential
D. Chemical - CORRECT ANSWER✅✅✅C. Potential
We use energy in many ways. Describe one thing we cannot do to energy.
ANSWERS
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 - CORRECT ANSWER✅✅✅D. All of those
Organic molecules that end in the suffix "-ase" often function as ________ molecules.
A. transport
B. storage
C. enzymatic
D. structural - CORRECT ANSWER✅✅✅C. Enzymatic
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). - CORRECT ANSWER✅✅✅E. Enzymes do all of these things
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. - CORRECT ANSWER✅✅✅A. None of the statements is false.
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. - CORRECT ANSWER✅✅✅D. Both (b) and (c).
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. - CORRECT ANSWER✅✅✅C. Lowering EA.
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. - CORRECT ANSWER✅✅✅E.
High-energy collisions are less common than low-energy collisions.
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?
A. This is probably a case where the enzyme changes the position of equilibrium.
B. It couldn't happen. Catalysis doesn't alter the enzyme.
C. There must be an error. Enzymes don't make covalent bonds with substrates.
D. At some point the bond between the amino acid and the substrate must break.
E. This is possible in theory, but it's never been observed. - CORRECT ANSWER✅✅✅D. At some point
the bond between the amino acid and the substrate must break.
What will be accomplished by lowering the activation energy of a reaction?
A. The reaction will reverse.
B. The reaction will proceed more quickly.
C. The reaction will stop completely.
D. The reaction will proceed more slowly. - CORRECT ANSWER✅✅✅B. The reaction will proceed
more quickly.
Water behind a dam has a certain amount of stored energy that can be released as the water falls over
the top of the dam. It may be enough energy to turn a mill wheel or an electricity-generating turbine.
Choose the term that best describes the type of energy stored in the water at the top of the dam.
A. Radiant
B. Kinetic
C. Potential
D. Chemical - CORRECT ANSWER✅✅✅C. Potential
We use energy in many ways. Describe one thing we cannot do to energy.
