Download Name Enzymes 2012 Substrate Mrs. Casey

Name
Enzymes
1. The enzyme beta-galactosidase is involved in a certain body reaction. 6. The graph below shows the effect of temperature on the relative rate
What will most likely happen if beta-galactosidase is not available?
of action of enzyme X on a protein.
A) The rate of the reaction will change.
B) Coenzymes will produce beta-galactosidase.
C) Different chemicals will be used in the reaction to replace the
enzyme.
D) A different enzyme will be used in the reaction.
2. Lipase, maltase, and protease are members of a group of catalysts
known as
A) carbohydrates
C) enzymes
B) fats
D) hormones
3. Which statement about enzymes is not correct?
A) Enzymes are specific because of their shape and catalyze only
certain reactions.
B) Enzymes are composed of polypeptide chains.
C) Enzymes form a temporary association with a reactant.
D) Enzymes are destroyed when they are used and must be
synthesized for each reaction.
4. Which statement best describes enzymes?
A)
B)
C)
D)
They slow down the rate of breathing.
They are the building blocks of polymers.
They influence the rate of chemical reactions.
They speed up the conduction of impulses along a nerve cell.
Which change would not affect the relative rate of action of enzyme X
?
A)
B)
C)
D)
the removal of the protein when the reaction is at 30°C
a decrease in temperature from 40°C to 10°C
the addition of cold water when the reaction is at 50°C
an increase in temperature from 70°C to 80°C
7. The chemical reactions taking place in a cell will most likely speed
up if the
A)
B)
C)
D)
concentration of the reactants is increased
genetic material in the nucleus stops replicating
size of the cell is increased
enzymes involved in the reaction become deaminated
5. The graph below shows the results of an action of the enzyme
catalase on a piece of meat. Evidence of enzyme activity is indicated
by bubbles of oxygen.
Which statement best summarizes the activity of catalase shown in
the graph?
A)
B)
C)
D)
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The enzyme works better at 10°C than at 50°C.
The enzyme works at the same level in all environments.
The enzyme works better at 5°C than at 65°C.
The enzyme works better at 35°C than at either temperature
extreme.
Substrate
Mrs. Casey
8. Base your answer to the following question on A process that occurs in the human body is shown in the diagram below.
What would happen if a temperature change caused the shape of the active site to be altered?
A) The dipeptide would digest slower or not at all.
C) The amino acids would combine slower or not at all.
B) The dipeptide would digest faster.
D) The amino acids would combine faster.
9. Which factor would have the least effect on the rate at which an
enzyme breaks down starch?
A)
B)
C)
D)
13. Antibody molecules and receptor molecules are similar in that they
both
the temperature at which the reaction is taking place
the pH of the solution in which the reaction is occurring
the wavelength of light illuminating the reaction
the concentrations of starch and enzyme
A)
B)
C)
D)
remove wastes from the body
speed up chemical reactions in cells
have a specific shape related to their specific function
control transport through the cell membrane
10. Base your answer to the following question on the graph below and
on your knowledge of biology.
Which section of the graph includes the point at which the enzyme
started to denature?
A) I
B) II
C) III
D) IV
11. The distortion (change in shape) of enzyme molecules which occurs
at high temperatures is known as
A) specificity
C) replication
B) synthesis
D) denaturation
12. The enzyme amylase will affect the breakdown of carbohydrates,
but it will not affect the breakdown of proteins. The ability of an
enzyme molecule to interact with specific molecules is most
directly determined by the
A)
B)
C)
D)
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number of molecules involved
sequence of bases present in ATP
shapes of the molecules involved
amount of glucose present in the cell
Substrate
Mrs. Casey
14. An enzyme and four different molecules are shown in the diagram below.
Which molecules would this enzyme most likely affect in a reaction?
A) molecules B and D
B) molecule C, only
C) molecule A, only
D) molecules A and C
15. The enzyme salivary amylase will act on starch, but not on protein.
This action illustrates that salivary amylase
A) contains starch
C) is not reusable
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B) is chemically specific
D) lacks protein
Substrate
Mrs. Casey
Biology (Living Environment)
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Substrate
Mrs. Casey