Which one of these is not an example using facilitated diffusion?
aquaporins facilitate the diffusion of water in the kidney tubules of many
mammals.
a carrier protein moves sucrose across the membrane with the
concentration gradient.
using the sodium-potassium pump involves the hydrolysis of atp and the
release of nat to the outside of the cell.
ca+2 moves from high cytoplasmic concentration to low concentration
inside the cell using a membrane-spanning protein.