Question

some molecules diffuse through selective transport proteins. if some molecules cant diffuse through the cell membrane by themselves, they can get help. transport proteins give them a ride through the membrane. this process is called facilitated diffusion. the word facilitate means \to make easier.\ different transport proteins make it easier for certain molecules to get through the cell membrane without a cell using energy. facilitated diffusion is another type of passive transport. in facilitated diffusion, do molecules move down their concentration gradient? explain.

Explanation:

Facilitated diffusion is a type of passive transport. Passive transport moves substances from an area of higher concentration to an area of lower concentration, which is moving down the concentration gradient. This is because it does not require energy input from the cell.

Answer:

Yes, molecules move down their concentration gradient in facilitated diffusion because facilitated diffusion is a passive - transport process and passive transport always occurs down the concentration gradient without the use of cellular energy.