Q. What does Km represent in enzyme kinetics?
-
A.
The maximum velocity of the reaction
-
B.
The substrate concentration at which the reaction rate is half of Vmax
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C.
The rate constant of the reaction
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D.
The enzyme's affinity for the substrate
Solution
Km is the substrate concentration at which the reaction rate is half of Vmax, indicating the enzyme's affinity for the substrate.
Correct Answer:
B
— The substrate concentration at which the reaction rate is half of Vmax
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Q. What effect does increasing temperature generally have on enzyme activity?
-
A.
Increases activity until a certain point
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B.
Decreases activity at all temperatures
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C.
Has no effect on activity
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D.
Increases activity indefinitely
Solution
Increasing temperature generally increases enzyme activity up to an optimal point, after which activity declines due to denaturation.
Correct Answer:
A
— Increases activity until a certain point
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Q. What is the effect of pH on enzyme activity?
-
A.
Enzymes work best at any pH
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B.
Each enzyme has an optimal pH range
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C.
pH has no effect on enzyme activity
-
D.
All enzymes are active at neutral pH only
Solution
Each enzyme has an optimal pH range where it functions best; deviations can lead to decreased activity or denaturation.
Correct Answer:
B
— Each enzyme has an optimal pH range
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Q. What is the primary function of enzymes in biochemical reactions?
-
A.
To increase the temperature of the reaction
-
B.
To act as a substrate
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C.
To lower the activation energy
-
D.
To change the equilibrium of the reaction
Solution
Enzymes lower the activation energy required for biochemical reactions, thereby increasing the reaction rate.
Correct Answer:
C
— To lower the activation energy
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Q. What is the role of cofactors in enzyme activity?
-
A.
To provide energy for the reaction
-
B.
To stabilize the enzyme structure
-
C.
To assist in the catalytic process
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D.
To act as a substrate
Solution
Cofactors assist in the catalytic process by helping the enzyme to perform its function more effectively.
Correct Answer:
C
— To assist in the catalytic process
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Q. What is the term for the maximum rate of an enzyme-catalyzed reaction?
-
A.
Vmax
-
B.
Km
-
C.
Turnover number
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D.
Michaelis constant
Solution
Vmax is the maximum rate of an enzyme-catalyzed reaction when the enzyme is saturated with substrate.
Correct Answer:
A
— Vmax
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Q. What is the term for the region on the enzyme where the substrate binds?
-
A.
Active site
-
B.
Allosteric site
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C.
Binding site
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D.
Catalytic site
Solution
The active site is the region on the enzyme where the substrate binds and the reaction occurs.
Correct Answer:
A
— Active site
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Q. Which factor does NOT affect enzyme activity?
-
A.
Temperature
-
B.
pH
-
C.
Substrate concentration
-
D.
Color of the enzyme
Solution
The color of the enzyme does not affect its activity; however, temperature, pH, and substrate concentration do.
Correct Answer:
D
— Color of the enzyme
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Q. Which of the following is an example of a coenzyme?
-
A.
Zinc
-
B.
Magnesium
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C.
NAD+
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D.
Calcium
Solution
NAD+ is a coenzyme that plays a crucial role in redox reactions in metabolism.
Correct Answer:
C
— NAD+
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Q. Which type of inhibition can be overcome by increasing substrate concentration?
-
A.
Non-competitive inhibition
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B.
Competitive inhibition
-
C.
Uncompetitive inhibition
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D.
Allosteric inhibition
Solution
Competitive inhibition can be overcome by increasing substrate concentration, as it competes with the substrate for the active site.
Correct Answer:
B
— Competitive inhibition
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