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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.
One major role of phospholipids in cells is to form membranes. Membranes in cells are phospholipid bilayers, which are barriers that prevent charged particles and large molecules from moving across them. The outer skin of the cell is a phospholipid bilayer.Eukaryotic cells also have skin surrounding defined organelles with different functions inside them.embranes in cells are phospholipid bilayers, which are barriers that prevent charged particles and large molecules from moving across them. The outer skin of the cell is a phospholipid bilayer. Eukaryotic cells also have skin surrounding defined organelles with different functions inside them.