Facilitated diffusion: sort the phrases into the appropriate bins depending on whether they are true only for channels, true only for carrier proteins, or true for both channels and carriers.

a. provide a continuous path across the membrane
b. transport primarily small polar organic molecules
c. provide hydrophilic path across the membrane
d. are integral membrane proteins
e. transport solutes down a concentration or electrochemical gradient
f. undergo a change in shape to transport solutes across the membrane
g. allow water molecules and small ions to flow quickly across the membrane