Which one of the following requires the cell to expend energy?
A)ECF moving into a cell via pinocytosis
B)Glucose moving through a facilitated diffusion carrier
C)K+ ions moving out of a cell
D)Water moving through an aquaporin
E)Na+ ions moving through a leak channel

Question

Quizplus · Accepted Answer

Pinocytosis is an active process that requires the cell to expend energy (in the form of ATP) to engulf extracellular fluid and bring it into the cell. Facilitated diffusion (Choice B), leak channels (Choice E), and aquaporins (Choice D) do not require energy expenditure by the cell. K+ ions moving out of a cell (Choice C) can occur either passively (down their concentration gradient) or actively (against their concentration gradient) depending on the circumstances, but in either case, the cell does not expend energy.

Which One of the Following Requires the Cell to Expend