Biology Enzymes SZABMU 2022
PMDC Verified Question 57 of 79
____ reduces the enzyme productivity by blocking the substrate from entering into the active site due to similar shapes.
A
Non-Competitive inhibitors
B
Activators
C
Competitive inhibitors
D
Co-enzymes
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Competitive inhibitors
Concept:

When two molecules share a very similar geometric structure, they can both fit into the same enzymatic binding pocket.

Solution:

  • Competitive inhibitors are structural imposters of the normal substrate.
  • By perfectly mimicking the substrate's shape, they successfully wedge themselves into the active site.
  • This creates a physical roadblock, preventing the true substrate from entering and bringing enzyme productivity to a halt.


Why other options are incorrect:

Non-competitive inhibitors do not have similar shapes and bind elsewhere. Activators and co-enzymes INCREASE enzyme productivity, they do not reduce it.

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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