Question

If a solute is moving through a phospholipid bilayer from an area of higher concentration to an area of lower concentration without the assistance of a protein, the manner of transport must be _______.
a. active transport
b. facilitated diffusion
c. simple diffusion
d. any of the above, depending on the solute
e. solutes cannot cross phospholipid bilayers.

Answer 1

C. simple diffusion.