Facilitated diffusion through a membrane involves which of the following scenarios? A. the diffusion of water through a selectively permeable membrane along its concentration gradient. B. the movement of a molecule against its concentration gradient with the expenditure of energy C. the plasma membrane surrounding (engulfi ng) the molecule & the molecule moving into the cell. D. a molecule binding to a receptor which moves the molecule through the membrane without the expenditure of energy
Option D. Facilitated diffusion through a membrane involves molecule binding to a receptor which moves the molecule through the membrane without the expenditure of energy
