AP Biologymediummcq1 pt
The sodium–potassium pump moves
A.3 Na⁺ out and 2 K⁺ in per ATP
B.2 Na⁺ in and 3 K⁺ out per ATP
C.Na⁺ and K⁺ down their gradients
D.only potassium across the membrane
Explanation
Core Concept
Against both gradients, the pump exports three sodium ions and imports two potassium ions for every ATP hydrolyzed, maintaining the cell's resting ion balance.
Correct Answer
A3 Na⁺ out and 2 K⁺ in per ATP
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