Biology Enzymes MDCAT 2014
PMDC Verified Question 77 of 79
A co-factor tightly bound to the enzyme on the permanent basis is called:
A
Activator
B
Prosthetic group
C
Apo-enzyme
D
Coenzyme
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Prosthetic group
Concept:

Co-factors are non-protein components required for enzyme activity. They are classified based on their chemical nature and how tightly they bind to the apoenzyme.

Solution:

  • If the non-protein part is covalently and permanently bonded to the enzyme's protein structure, it is defined as a prosthetic group.
  • This tight binding ensures the group is always present to assist in the enzyme's specific biochemical reaction.


Why other options are incorrect:

A coenzyme is loosely attached and organic. An activator is loosely attached and inorganic. An apoenzyme is the protein portion of the enzyme itself without its cofactor.

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