How is osmosis different from passive transport? Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion. What is the role of the cell membrane in active and passive transport? Active transport is the movement of molecules across a cell membrane in the direction against their concentration gradient, going from a low concentration to a high concentration. Active transport uses cellular energy, unlike passive transport, which does not use cellular energy. Fashion Complete Guide to Build Your Career in Fashion Industry Nicolas Desjardins 0 Comments Complete Guide to Build Your Career in Fashion Industry Introduction The Fashion Industry is one of the fastest-growing industries. It Read more