The relative permeability of a synthetic lipid bilayer to different classes of molecules. 03 HYDROPHOBIC CO2 MOLECULES N2 If uncharged solutes are small enough, benzene they can move down their concentration SMALL gradients directly across the lipid bilayer by UNCHARGED H2O POLAR urea simple diffusion. MOLECULES glycerol Most solutes can move across the LARGE glucose membrane only if there is a membrane UNCHARGED POLAR sucrose transport protein to transfer them. MOLECULES Passive transport,in the same direction H',Na" HCO K' as a concentration gradient. IONS Ca2,CI Mg2+ Active transport,is mediated by carrier proteins,against a electrochemical gradient, require an input of energy. synthetic lipid bilayer This document is produced by trial version of Print2Flash.Visit www.print2flash.com for more information