Biology Enzymes MDCAT 2017
PMDC Verified Question 74 of 79
Which of the following comprises of inorganic ions?
A
Apoenzyme
B
Coenzymes
C
Prosthetic group
D
Activators
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Activators
Concept:

Enzyme co-factors are divided into organic and inorganic categories. Inorganic co-factors are typically metal ions necessary for catalysis.

Solution:

  • Activators are strictly inorganic ions (such as \( \text{Mg}^{2+} \), \( \text{Fe}^{2+} \), \( \text{Cu}^{2+} \), \( \text{Zn}^{2+} \)) that temporarily bind to the enzyme to enhance its activity.
  • They act as a 'bridge' between the enzyme and the substrate.


Why other options are incorrect:

Coenzymes are organic molecules. Prosthetic groups are covalently bonded (can be organic or inorganic, but 'activator' specifically defines the detachable inorganic ion class). The apoenzyme is the protein part.

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