Question

_________ are responsible for the transport of substances down a concentration gradient during facilitated diffusion.

Answer 1

Channel proteins are responsible for the transport of substances down a concentration gradient during facilitated diffusion.

Channel proteins are proteins that enable the transportation of certain substances and materials across cell membranes.

Answer 2

Channel proteins

Channel proteins are macromolecules that are embedded in plasma membranes of cells. Their function is to provide a pathway for molecules into and out of the cell, as the remaining parts of the membrane are impermeable. An example of such protein channels are those that are present to facilitate the diffusion of glucose.