Enzymes
REGENTS PRACTICE
(4) the temperature before the reaction occurs
1. Meat tenderizer contains an enzyme that interacts with
meat. If meat is coated with tenderizer and then placed in a
refrigerator for a short time, how would the enzyme be
affected?
(1)
(2)
(3)
(4)
5. The graph below shows the affect of temperature on the
relative rate of action of enzyme X on a protein.
It would be broken down.
Its activity would slow down.
Its shape would change.
It would no longer act as an enzyme.
2. Which condition is necessary for enzymes to function
properly in the human body?
(1)
(2)
(3)
(4)
These chemicals must have a specific shape.
These chemicals must be able to replicate.
Body temperature must be above 40°C.
Body pH must be above 10.
Which change would not affect the relative rate of action of
enzyme X?
3. The graph below illustrates the relative amounts of
product formed by the action of an enzyme in a solution with
a pH of 6 at seven different temperatures.
(1) the addition of cold water when the reaction is at
50°C
(2) an increase in temperature from 70°C to 80°C
(3) the removal of the protein when the reaction is at
30°C
(4) a decrease in temperature from 40°C to 10°C
6. The diagram below represents a beaker containing a
solution of various molecules involved in digestion.
Which statement best expresses the amount of product that
will be formed at each temperature if the experiment is
repeated at a pH of 4?
(1) The amount of product formed will be equal to that
produced at pH 6.
(2) The amount of product formed will be greater than
that produced at pH 6.
(3) The amount of product formed will be less than that
produced at pH 6.
(4) The amount of product formed can not be accurately
predicted.
Which structures represent products of digestion?
(1) A and D
(2) B and C
(3) B and E
(4) D and E
7. An enzyme and four different molecules are shown in the
diagram below.
4. The equation below represents a chemical reaction that
occurs in humans.
What data should be collected to support the hypothesis that
enzyme C works best in an environment that is slightly basic?
(1) the shape of enzyme C
(2) the amount of substance W produced in five minutes
at various pH levels
(3) the shapes of substances X and Y after the reaction
occurs
The enzyme would most likely affect reactions involving
(1) molecule A, only
(2) molecule C, only
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(3) molecules B and D
(4) molecules A and C
Base your answers to questions 8 and 9 on the graph below
and on your knowledge of biology.
8. Pepsin works best in which type of environment?
(1)
(2)
(3)
(4)
acidic, only
basic, only
neutral
sometimes acidic, sometimes basic
9. Neither enzyme works at a pH of
(1) 1
(2) 5
(3) 3
(4) 4
10. An incomplete graph is shown below:
What label could appropriately be used to replace letter Z on the axis?
Base your answers to questions 11 and 12 on the statement below and on your knowledge of biology:
Some internal environmental factors may interfere with the ability of an enzyme to function efficiently.
11. Identify two internal environment factors that directly influence the rate of enzyme action.
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12. Explain why changing the shape of an enzyme could affect the ability of the enzyme to function.
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13. Enzyme molecules are affected by changes in conditions within organisms. Explain how a prolonged, excessively high body
temperature during an illness could be fatal to humans.
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