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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 serve as a permeable barrier for the cell membrane and its internal organelles. They also provide support and serve as the site for catalytic processes. They have roles in signal transduction and are precursors for signaling processes and the synthesis of molecules.