Question

The movement of potassium into an animal cell requires

A) low cellular concentrations of sodium.
B) high cellular concentrations of potassium.
C) an energy source such as ATP.
D) a cotransport protein.
E) a potassium channel protein.

Answer 1

The movement of potassium ions into an animal cell requires ATP, which is used by the sodium-potassium pump to actively transport ions against their concentration gradients.

Step-by-step explanation:

The movement of potassium into an animal cell indeed requires an energy source such as ATP. This energy is utilized by the sodium-potassium pump (Na+-K+ ATPase), a type of active transport. The pump moves potassium ions (K+) inside the cell and sodium ions (Na+) outside of the cell, against their concentration gradients, thus maintaining the vital electrochemical gradient within the cell. ATP is used by the pump to change its shape, allowing it to bind and transport the ions across the cell membrane.