In a plasma membrane, simple diffusion of various substances can occur
A)through channels
B)through carriers
C)between phospholipid molecules
D)through aquaporins
E)into the cell but not out of the cell

Question

Quizplus · Accepted Answer

Simple diffusion occurs between phospholipid molecules, as they are the main component of the plasma membrane and allow for the movement of small, non-polar molecules such as oxygen and carbon dioxide.

Answer: A and B
 Channels and carriers are both methods of facilitated diffusion, which allows for the movement of larger molecules such as ions and glucose across the plasma membrane. Channels form pores that allow for movement based on concentration gradients, while carriers undergo a conformational change to transport molecules across the membrane.

In a Plasma Membrane, Simple Diffusion of Various Substances Can