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During the action of a sodium-potassium pump, 50 ATP molecules were spent. Predict how many sodium ions are transported across the cell membrane. a. 50 b. 100 c. 150 d. 200
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1 ATP molecule allows 3 Na+ to move out of the cell and 2 K+ to enter. So 50 ATP molecules allow 150 Sodium ions to move out and 100 Potassium ions to move in. Choice C.
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