Which of these statements describes some aspect of facilitated diffusion? a. Facilitated diffusion is another name for osmosis. b. Facilitated diffusion of solutes occurs through phospholipid pores in the membrane. c. Facilitated diffusion requires energy to drive a concentration gradient. d. Facilitated diffusion of solutes may occur through protein pores in the membrane. e. There is only one kind of protein pore for facilitated diffusion

D

Explanation:

Facilitated diffusion is a form of passive transport hence no energy is required by the cell. This means that while the molecules are moving down a concentration gradient - line normal diffusion - the movement of the molecules needs to be facilitated (in this case by a transmembrane protein) either because the molecule is polar and can't pass through the hydrophobic region of the cell membrane, or the molecule is too big to passively pass through the small natural pores of the cell membrane.