<prompt> True about facilitated diffusion are all except:Occur in direction of concentration gradient.Does not require energy.Occur in direction opposite to electrical gradient.Facilitated by charge of molecule.  <response>: Ganong 22 31When carrier proteins move substances in the direction of their chemical or electrical gradient, no energy input is required and the process is called facilitated diffusion.Diffusion- process in which solute particles move from a more concentrated environment to a less concentrated one in order to bring a uniform concentration throughout. 