Download Enzyme Wi(Re) - Honors Bio

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Honors Biology
Enzyme Wi(Re)
1. Because enzymes affect the speed of chemical reactions without being consumed, they are referred
to as
a. Hydrogen acceptors
b. Activation energy
c. Catalysts
d. Transformation proteins
2. Which of the following is characteristic of enzymes?
a. They lower the energy of activation of a reaction by binding the substrate
b. They raise the energy of activation of a reaction by binding the substrate
c. They lower the amount of energy present in the substrate
d. They raise the amount of energy present in the substrate
3. An enzyme is generally named by adding ____ to the end of the name of the _____.
a. –ose; cell in which it’s found
b. –ase; cell in which it’s found
c. –ose; substrate
d. –ase; substrate
4. The minimum amount of energy needed for a process to occur is called the
a. Process energy
b. Kinetic energy
c. Activation energy
d. Minimal energy theory
North Star Academy College Preparatory High School
5. Which of the following statements concerning activation energy is FALSE?
a. Exergonic reactions have an energy of activation
b. Endergonic reactions have an energy of activation
c. Catalysts raise a reaction’s activation energy
d. Activation energy is the energy required to break existing bonds
6. A reaction with a negative ∆G value is referred to as which type of reaction?
a. Endergonic
b. Entropy
c. Exergonic
d. Activation
7. Consider the following reaction, below. Which of the following statements correctly describes this
reaction?
A + B  C + D + energy
a.
b.
c.
d.
This reaction is exergonic
An enzyme could still sped up the rate of reaction
ATP is not needed to make the reaction proceed
All of the above
8. An endergonic reaction can proceed only if it absorbs
a. more free energy than is released by a coupled exergonic reaction
b. less free energy than was released by a coupled endergonic reaction
c. less free energy than is released by a coupled exergonic reaction
d. the same amount of free energy that is absorbed by the enzymatic breakdown of proteins
9. Parts of the enzyme molecule that interact with a substrate are called
a. Cofactors
b. Active sites
c. Induced-fit models
d. Reaction sites
10. Hydolases are one important class of enzyme that function to catalyze
a. Splitting a molecule using water
b. Reactions in which double bonds are formed
c. Oxidation-reduction reactions
d. Builds macromolecules while losing water
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Questions 11-12 refer to the following diagram, below.
11. The line on the graph labeled B represents the
a. Activation energy with an enzyme
b. Activation energy without an enzyme
c. Free energy of the reactants
d. Change in entropy
12. The line on the graph labeled C represents the
a. Activation energy with an enzyme
b. Activation energy without an enzyme
c. Change in free energy
d. Change in entropy
13. Which of the following does NOT change in an enzyme catalyzed reaction?
a. The energy of the reactants
b. The energy of the products
c. The change in free energy
d. None of the above
14. Which statement describes the accepted model of how an enzyme and substrate fit together?
a. As the product is released, the enzyme breaks down
b. The enzyme is like a key that fits into the substrate, which is like a lock
c. The active site is permanently changed by its interaction with the substrate
d. As the substrate binds to the enzyme, the shape of the enzyme site changes to
accommodate the reaction
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15. Which statement is NOT true about the effects of various conditions on the activity of an enzyme?
a. Higher temperatures generally increase the activity of an enzyme up to a point
b. Above a certain range of temperatures, the protein of an enzyme is denatured
c. A change in pH can cause an enzyme to be inactivated
d. An enzyme's activity is generally reduced by an increase in substrate concentration
16. An inhibitor that changes the overall shape and chemistry of an enzyme is known as a(n)?
a. Allosteric inhibitor
b. Competitive inhibitor
c. Steric inhibitor
d. None of the above
17. Competitive inhibitors inhibit biochemical reactions in such a way as to seemingly
a. Increase the concentration of substrate
b. Reduce the concentration of enzyme
c. Increase the concentration of enzyme
d. Reduce the concentration of substrate
18. Which statement is NOT true about enzyme inhibition?
a. In competitive inhibition, the inhibitor binds to the active site of the enzyme
b. In noncompetitive inhibition, the inhibitor binds to the allosteric site of the substrate
c. In irreversible inhibition, a poison binds to the enzyme so that it can never work again
d. Most inhibitors act in a reversible fashion
19. A student conducts an experiment to test the efficiency of a certain enzyme. Which would probably
not result in a change in the enzyme's efficiency?
a. Bringing the temperature of the experimental setup from 20°C to 50°C
b. Adding an acidic solution to the setup
c. Adding more substrate but not enzyme
d. Placing the substrate and enzyme in a container with double the capacity
20. When you have a severe fever, what may be a grave consequence if this is not controlled?
a. destruction of your enzymes' primary structure
b. removal of amine groups from your proteins
c. change in the folding of enzymes
d. removal of the amino acids in active sites
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