Multiple Choice
Which of the following defines the type of transport by the sodium-potassium ATPase?
11. Biological Membranes and Transport
Sodium-Potassium Ion Pump
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Does the sodium-potassium ion pump (Na⁺/K⁺-ATPase) require ATP to transport ions across the plasma membrane?
A
No; it is powered only by the Na⁺ gradient (secondary active transport) and does not use ATP directly.
B
Yes; but ATP is required only to open the pump and does not provide energy for ion movement.
C
No; it is a passive channel that allows Na⁺ and K⁺ to diffuse down their gradients.
D
Yes; it directly hydrolyzes ATP to drive active transport of ions.
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