7. Which one is NOT a valid description about diffusion of particle in cells?
(A) The passive transport of particles depends on diffusion.
(B) There is no energy investment for cells when passive transport happens.
(C)When transport across cell membrane, the driving direction of the molecules depends on concentration
gradient.
(D) If the environment of a cell is hypotonic, the size of the cell would enlarge.
(E) Diffusion across cell membrane never involve transport proteins.