Which of the following is an example of electroneutral pump?

Correct option is B

✅ (b) H⁺/K⁺-ATPase
· H⁺/K⁺-ATPase exchanges protons (H⁺) for potassium ions (K⁺) across membranes.
· Since both ions carry a single positive charge, the exchange is electroneutral.
· Commonly found in the stomach lining for acid secretion and in plants for ionic balance.
❌ (a) Ca²⁺-ATPase
· Transports calcium ions (Ca²⁺) without a counter ion, leading to electrogenic activity.
· Not electroneutral, as it moves net positive charge.
❌ (c) H⁺-PPase
· H⁺-Pyrophosphatase actively pumps protons across membranes, creating an electrochemical gradient.
· Electrogenic, not electroneutral.
❌ (d) H⁺-ATPase
· Pumps H⁺ ions across the membrane, contributing to membrane potential generation.
· Electrogenic pump.