Question

Cell membranes are selectively permeable, regulating which substances can pass through, as well as how much of each substance can enter or exit at a given time. In cells, some molecules can move down their concentration gradients by crossing the phospholipid portion of the membrane directly, while others must pass through membrane proteins. Which of these statements does NOT apply to facilitated diffusion?

Answer 1

Facilitated diffusion is a form of passive transport that involves the movement of molecules down their concentration gradient with the help of specific transport proteins.

Step-by-step explanation:

Facilitated diffusion is a form of passive transport that allows large, polar, or charged molecules to cross the cell membrane with the help of specific transport proteins. Unlike simple diffusion, facilitated diffusion does not require energy and involves the movement of molecules down their concentration gradient. It is important to note that facilitated diffusion only refers to the movement of substances through membrane proteins and not the direct crossing of the phospholipid bilayer.