MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: D. Most active sites become occupied
Explanation:
Once active sites are saturated, added substrate cannot greatly increase rate.
Enzyme concentration becomes limiting.
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Correct Answer: A. Cerebellum
Explanation:
The cerebellum integrates sensory information for posture and coordination.
Damage commonly causes unsteady movement.
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Correct Answer: A. It can reduce the inhibitor effect
Explanation:
Substrate and competitive inhibitor compete for the active site.
More substrate raises the chance of productive binding.
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Correct Answer: B. Medulla oblongata
Explanation:
The medulla contains vital autonomic centers.
It regulates respiration and cardiovascular activity.
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Correct Answer: B. It can reduce the inhibitor effect
Explanation:
Substrate and competitive inhibitor compete for the active site.
More substrate raises the chance of productive binding.
Choose an option to check your answer.
Correct Answer: C. Medulla oblongata
Explanation:
The medulla contains vital autonomic centers.
It regulates respiration and cardiovascular activity.
Choose an option to check your answer.
Correct Answer: C. It can reduce the inhibitor effect
Explanation:
Substrate and competitive inhibitor compete for the active site.
More substrate raises the chance of productive binding.
Choose an option to check your answer.
Correct Answer: D. Medulla oblongata
Explanation:
The medulla contains vital autonomic centers.
It regulates respiration and cardiovascular activity.
Choose an option to check your answer.
Correct Answer: D. The inhibitor alters enzyme activity at another site
Explanation:
A noncompetitive inhibitor binds away from the active site.
It lowers the amount or efficiency of functional enzyme.
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Correct Answer: A. Cerebrum
Explanation:
The cerebrum contains sensory, motor and association areas.
It supports memory, reasoning and voluntary movement.
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Correct Answer: A. The inhibitor alters enzyme activity at another site
Explanation:
A noncompetitive inhibitor binds away from the active site.
It lowers the amount or efficiency of functional enzyme.
Choose an option to check your answer.
Correct Answer: B. Cerebrum
Explanation:
The cerebrum contains sensory, motor and association areas.
It supports memory, reasoning and voluntary movement.
