Cotransport may involve
a. active transport of two solutes through a transport protein
b.passive transport of two solutes through a transport protein
c. ion diffusion against the electrochemical gradient created by an electrogenic pump.
d. A pump such as the sodium-potassium pump that moves ions in two different directions.
e. Transport of one solute against its concentration gradient in tandem with another that is diffusing down its concentration gradient
Answer: E