Phospholipids are most likely to be found in the cell membrane. It is the most important class of lipids for the construction of cell membranes. It is also the major component found in a cell membrane. It forms lipid bilayers that are amphiphilic (water and fat loving) in nature.
In the cell membrane, the structure of phospholipid molecule has two hydrophobic fatty acid tails and one hydrophilic head.
This lipid bilayer is the barrier that helps keep ions and other materials where there are supposed to be and prevent them from being diffused into areas where there should not be.