Biology Enzymes KMU 2024
PMDC Verified Question 6 of 79
What happens to the enzyme after an enzyme-catalyzed reaction?
A
Reduced to inactive form
B
Becomes inert
C
Changes into substrate
D
Used for another reaction
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Used for another reaction
Concept:

A fundamental property of any catalyst, biological or inorganic, is that it is not consumed by the reaction it facilitates.

Solution:

  • During catalysis, the enzyme temporarily binds to the substrate to form an ES complex.
  • Once the bonds are rearranged, the product is released.
  • The enzyme itself remains structurally and chemically unchanged, meaning it is instantly ready and used for another reaction. This reusability is why enzymes are only needed in very small concentrations in the body.


Why other options are incorrect:

Enzymes do not become inert or inactive simply by performing their job. They certainly do not magically transform into their own substrates.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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