Which of the Following Processes Includes All Others

Question

Which of the following processes includes all others?
A)osmosis
B)diffusion of a solute across a membrane
C)facilitated diffusion
D)passive transport
E)transport of an ion down its electrochemical gradient

Accepted Answer

Passive transport includes all of the other processes listed (osmosis, diffusion of solutes across a membrane, facilitated diffusion, and transport of ions down their electrochemical gradient) because it refers to the movement of molecules or ions across a membrane without the input of energy.