Sample Questions — Enzymes
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MCQ
In the enzyme-substrate complex, the enzyme:
✅ Correct Answer: C
Enzyme binds substrate reversibly at the active site to form the enzyme-substrate complex.
MCQ
Which of the following affects enzyme activity?
A. Substrate concentration
B. pH
C. Light intensity
D. Temperature
✅ Correct Answer: A
Enzyme activity depends on optimal temperature, pH, and substrate availability. Light has no effect.
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MCQ
Which of the following best defines the role of the enzyme active site?
✅ Correct Answer: C
The enzyme’s active site facilitates substrate binding and lowers activation energy by stabilizing the intermediate.
MCQ
How does substrate concentration affect the rate of enzyme activity?
✅ Correct Answer: C
As substrate concentration increases, the reaction rate rises but levels off when enzyme sites are saturated.
MCQ
Which of the following does NOT belong to factors affecting enzyme activity?
✅ Correct Answer: D
Light does not influence enzyme activity directly.
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