Biology Enzymes BUMHS 2022
PMDC Verified Question 45 of 79
The catalytic site of enzyme is made up of how many amino acids?
A
50-100
B
3-12
C
100-1000
D
30-50
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 3-12
Concept:

The bulk of an enzyme's protein structure exists primarily to maintain the exact 3D framework required for a tiny functional region.

Solution:

  • The active/catalytic site is a very small region on the surface of the enzyme.
  • Different amino acids are specifically arranged into this site, but their total number is surprisingly small—typically varying from only 3 to 12 amino acids.
  • The rest of the hundreds of amino acids merely provide the structural scaffolding to keep those 3-12 amino acids in the exact right spatial orientation.


Why other options are incorrect:

Numbers like 50-100 or 100-1000 refer to the entire length of the polypeptide chain that forms the whole enzyme, not the minute active site.

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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