Biology Enzymes KMU 2024
PMDC Verified Question 11 of 79
Catalase can be activated at pH:
A
1
B
3
C
5
D
7
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 7
Concept:

Catalase is a vital protective enzyme found universally in the peroxisomes of nearly all aerobic living cells to neutralize toxic hydrogen peroxide.

Solution:

  • Because catalase operates inside the general intracellular environment of the cell (which is kept near physiological neutrality), its structure is optimized for this environment.
  • Therefore, catalase functions optimally at a neutral pH of approximately 7.0 (specifically around 7.6).


Why other options are incorrect:

A pH of 1 or 3 is extremely acidic (similar to stomach acid) and would instantly denature the intracellular catalase protein. pH 5 is also too acidic for peak catalase efficiency.

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