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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. A phospholipid is composed of two fatty acids, a glycerol unit, a phosphate group and a polar molecule. Photo Credit: Image credit: Ties van Brussel / Tiesworks.nl. Phospholipids belong to the lipid family of biological polymers. phospholipid is composed of two fatty acids, a glycerol unit, a phosphate group and a polar molecule. Photo Credit: Image credit: Ties van Brussel / Tiesworks.nl. Phospholipids belong to the lipid family of biological polymers.