What is the exact number of Na+ ions pumped out per ATP hydrolyzed?

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Multiple Choice

What is the exact number of Na+ ions pumped out per ATP hydrolyzed?

Explanation:
The key idea here is how the sodium-potassium pump uses energy to move ions against their gradients. For each molecule of ATP it hydrolyzes, the pump moves three sodium ions (Na+) out of the cell and two potassium ions (K+) in. This happens through a cycle: three Na+ bind on the inside, ATP donates a phosphate and triggers a conformational change that releases Na+ outside, then two K+ bind from outside and are released inside when the pump returns to its original state. Because three Na+ are moved with every ATP hydrolyzed, the exact number is three.

The key idea here is how the sodium-potassium pump uses energy to move ions against their gradients. For each molecule of ATP it hydrolyzes, the pump moves three sodium ions (Na+) out of the cell and two potassium ions (K+) in. This happens through a cycle: three Na+ bind on the inside, ATP donates a phosphate and triggers a conformational change that releases Na+ outside, then two K+ bind from outside and are released inside when the pump returns to its original state. Because three Na+ are moved with every ATP hydrolyzed, the exact number is three.

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