The cell membrane controls movement of materials into and out of the cell. the following particles are moving from high concentration to low concentration and are using a carrier protein. how would you describe this type of movement across the membrane?

The movement of particles from high concentration to low concentration gradient that uses a carrier protein is called Facilitated diffusion. In facilitated diffusion, the protein channels or carrier protein in the cell membranes allows the particles to move in or move out of the cell from high concentration down to their low concentration gradient. 

the answer will be a) proteins i believe

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