Question

Which of the following characterizes the sodium-potassium pump?
A) Sodium ions are pumped out of a cell against their gradient.
B) Potassium ions are pumped into a cell against their gradient.
C) The pump protein undergoes a conformational change.
D) Only A and B are correct.
E) A, B, and C are all correct.

Answer 1

E
- The sodium-potassium pump moves sodium out of the cell, potassium inside the cell, and due largely to conformational shifts induce by phosphorylation of the pump protein.