![]() ![]() ![]() Embedded in the lipid bilayer of most cell membranes are protein molecules, carbohydrates molecules are attached to many of these proteins.When these lipids are mixed with water, their hydrophobic fatty acid “tails” cluster together while their hydrophilic “heads” are attracted to water.The fatty acid portion of a phospholipid is hydrophobic (“water-fearing”), while the opposite end of the molecule (the head) is hydrophilic (“water-loving”).The layered structure of cell membranes reflects the chemical properties of the lipids that make them up.The lipid bilayer gives cell membranes a flexible structure that forms a strong barrier between the cell and its surroundings.All cells contain cell membranes, which almost always are made up of a double-layered sheet called a lipid bilayer.
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