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Let's review. Phospholipids are a type of lipid-one of the four main classes of molecules that make up living things. Phospholipids serve a very important function by surrounding and protecting internal cell components.
Phospholipids are amphipathic molecules that make up the bilayer of the plasma membrane and keep the membrane fluid. Describe phospholipids and their role in cells. Phospholipids consist of a glycerol molecule, two fatty acids, and a phosphate group that is modified by an alcohol.