omplete the blanks by matching with one of the given terms - The specialized functions of different membranes are largely determined by the they contain. - All cell membranes have the same amphipathic structure, with the of the phospholipids facing into the interior of the membrane and the hydrophillic head groups on the outside. - Membrane proteins that extend through the lipid bilayer are called proteins and have hydrophobic regions that are exposed to the interior of the bilayer. - The most common lipids in most cell membranes are the .