Phospholipids

Phospholipids are very much like triglycerides but with one

important difference. A phosphate functional group is substituted

for one of the three fatty acids

Phospholipids are a class of lipids and are a major component of

all cell membranes as they can form. Most phospholipids contain

a diglyceride, a phosphate group, and a simple organic molecule

such as choline; one exception to this rule is sphingomyelin, which

is derived from sphingosine instead of glycerol.