Biology Enzymes SZABMU 2022
PMDC Verified Question 44 of 79
The catalytic activity of an enzyme is restricted to its small portion:
A
Regulation site
B
Allosteric site
C
Active site
D
Passive site
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Active site
Concept:

Although an enzyme is a massive macromolecule made of hundreds of amino acids, only a tiny fraction of its surface is actually involved in the chemical reaction.

Solution:

  • This highly restricted, specific region is called the active site.
  • The active site is a uniquely shaped cleft or crevice composed of a small number of specific amino acids (usually 3 to 12) where the substrate binds and is converted into a product.


Why other options are incorrect:

The allosteric/regulation site is used for turning the enzyme on or off via effector molecules, not for the main catalytic conversion of the substrate. 'Passive site' is not a recognized biological term.

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