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Plasma Membrane
The chemical structure of the plasma membrane is called the fluid mosaic model. It is an exceedingly thing structure composed of a double layer, also known as a bilayer, of lipid molecules with protein molecules dispersed in it. The proteins form a changing, "mosaic" model. The lipid bilayer forms the basic "fabric" part of the membrane. It is made up of phospholipids, cholesterol, and glycolipids. Every phospholipid molecule has a polar head that is hydrophilic, and an uncharged nonpolar tail, made of fatty acids and is hydrophobic. The polar heads attract the water, and lie on the inner and outer surface of the membrane. The nonpolar tails do not like water so they lie in the center of the membrane. This creates a sandwich like molecule.