Which of the following statements about the Na + -K + pump is incorrect? It regu

Question

Which of the following statements about the Na+-K+ pump is incorrect?

It regulates cell volume by controlling the concentration of solutes inside the cell.

It has ATPase activity.

Phosphorylation of the pump must occur before K+ can attach to its binding site.

It helps decrease Na+ and K+ concentration gradients across the plasma membrane.

It regulates cell volume by controlling the concentration of solutes inside the cell.

It has ATPase activity.

Phosphorylation of the pump must occur before K+ can attach to its binding site.

It helps decrease Na+ and K+ concentration gradients across the plasma membrane.

Explanation / Answer

The Na K+ pump performs 3 important roles:

1. It establishes Na and K+ concentration gradients throughout the plasma membrane of all cells; those gradients are severely essential in the capability of nerve and muscle cells to generate electric signals for their functioning.

2. It facilitates regulate cell volume via controlling the concentrations of solutes inside the cell and thus minimizing osmotic effects that would result in swelling or shrinking of the cell.

3. The energy used to run the Na -K pump serves as the energy source for secondary energetic transport.

So answer is C

Phosphorylation of the pump must occur before K+ can attach to its binding site.

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