The Endomembrane System · NCERT Biology

The acidic environment inside lysosomes is maintained by:

  1. Passive diffusion of H+ ions
  2. ATP-driven proton pumps
  3. Sodium-potassium pumps
  4. Calcium channels
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Correct answer: ATP-driven proton pumps

Proton pumps actively transport H+ ions into lysosomes. This creates an acidic pH necessary for enzyme activity.

Difficulty: Medium Question 14 of 20

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