What happens when diffusion moves molecules across the plasma membrane?
A) Most molecules are capable of crossing the phospholipid bilayer at any location and at basically the same rate.
B) Energy input is required to transport molecules.
C) The rate of diffusion cannot be influenced by the cell.
D) The cell gains needed materials and gets rid of excess materials very quickly.
E) The process is relatively slow and is driven by concentration gradients.

Question

Quizplus · Accepted Answer

Diffusion across the plasma membrane is a passive process that does not require energy and is driven by concentration gradients, where molecules move from an area of higher concentration to an area of lower concentration until equilibrium is reached. This process is relatively slow compared to active transport mechanisms.

What Happens When Diffusion Moves Molecules Across the Plasma Membrane