Q. What happens to enzymes at high temperatures?
-
A.
They become more active
-
B.
They denature and lose function
-
C.
They remain unchanged
-
D.
They increase substrate affinity
Solution
At high temperatures, enzymes can denature, losing their functional shape and activity.
Correct Answer:
B
— They denature and lose function
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Q. What is the effect of a competitive inhibitor on enzyme activity?
-
A.
Increases reaction rate
-
B.
Decreases reaction rate
-
C.
No effect on reaction rate
-
D.
Changes the enzyme's structure
Solution
A competitive inhibitor decreases the reaction rate by competing with the substrate for the active site.
Correct Answer:
B
— Decreases reaction rate
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Q. What is the primary function of enzymes in the body?
-
A.
To provide energy
-
B.
To catalyze biochemical reactions
-
C.
To transport oxygen
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D.
To store genetic information
Solution
Enzymes act as catalysts that speed up biochemical reactions without being consumed in the process.
Correct Answer:
B
— To catalyze biochemical reactions
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Q. What is the term for the specific region on an enzyme where the substrate binds?
-
A.
Active site
-
B.
Allosteric site
-
C.
Binding pocket
-
D.
Catalytic center
Solution
The active site is the specific region on an enzyme where the substrate binds and the reaction occurs.
Correct Answer:
A
— Active site
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Q. Which enzyme is involved in the digestion of carbohydrates?
-
A.
Pepsin
-
B.
Amylase
-
C.
Lipase
-
D.
Trypsin
Solution
Amylase is the enzyme that breaks down carbohydrates into simpler sugars.
Correct Answer:
B
— Amylase
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Q. Which enzyme is responsible for breaking down hydrogen peroxide in cells?
-
A.
Catalase
-
B.
Amylase
-
C.
Lipase
-
D.
Protease
Solution
Catalase is the enzyme that catalyzes the decomposition of hydrogen peroxide into water and oxygen.
Correct Answer:
A
— Catalase
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Q. Which of the following is NOT a characteristic of enzymes?
-
A.
They are proteins
-
B.
They are consumed in reactions
-
C.
They lower activation energy
-
D.
They are specific to substrates
Solution
Enzymes are not consumed in reactions; they can be used repeatedly.
Correct Answer:
B
— They are consumed in reactions
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Q. Which of the following statements about enzymes is true?
-
A.
Enzymes can work on any substrate
-
B.
Enzymes are specific to their substrates
-
C.
Enzymes do not require cofactors
-
D.
Enzymes are only found in humans
Solution
Enzymes are specific to their substrates, meaning each enzyme typically catalyzes only one type of reaction.
Correct Answer:
B
— Enzymes are specific to their substrates
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