If a molecule crosses a plasma membrane faster than it diffuses in water, then the process is likely to involve active transport.

Question

Quizplus · Accepted Answer

Active transport is a process that uses energy to move molecules across a cell membrane against their concentration gradient. This means that the molecules are moving from an area of low concentration to an area of high concentration. Diffusion is a process that moves molecules from an area of high concentration to an area of low concentration. Therefore, if a molecule crosses a plasma membrane faster than it diffuses in water, then the process is likely to involve active transport.

If a Molecule Crosses a Plasma Membrane Faster Than It