Phospholipids have one glycerol molecule, 2 fatty acids, and a phosphate group.
There is a hydrophilic and a hydrophobic end, due to the ionic phosphate group. Because of this nature, when placed in water, the phospholipids form a bilayer, whereby the hydrophilic heads face outwards, and the hydrophobic tails inwards.
These bilayers are the basis of plasma membranes.
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