When ends of the bilayer connect, head groups face the interior and exterior water with the tails sequestered away from water. Gives the membrane its fluidity. Membrane Proteins 1. Two broad categories based on location. Provides the membrane with almost all the dynamic functions.
Channels have open and close states and thus variable amounts of flux.
They, however, do not bind the moving substance. Each carrier has a specific molecule or family of molecules it transports. Finite number of these cycles per time. Membrane Carbohydrates 1. Short branched chains of monosaccrides.