Water is a polar molecule, yet it easily moves through the nonpolar portions of cell membranes.Which transport process is responsible?
A) facilitated diffusion
B) simple diffusion
C) uniport
D) symport
E) antiport

Question

Quizplus · Accepted Answer

Water can diffuse through the nonpolar regions of the cell membrane via simple diffusion, although the rate of diffusion is likely enhanced by protein channels called aquaporins. Facilitated diffusion relies on the presence of a transport protein to facilitate movement across the membrane, while uniports, symports, and antiports are types of active transport that require energy input to move molecules against their concentration gradient.

Water Is a Polar Molecule, Yet It Easily Moves Through