Final answer:
Glycerophospholipids are composed of glycerol, two fatty acids, phosphoric acid, and a base. Phosphoglycerates are the most abundant phospholipids in cell membranes.
Step-by-step explanation:
Glycerophospholipids are composed of glycerol, two fatty acids, phosphoric acid, and a base. The base in the case of phosphatidyl choline or lecithin is choline.
Phosphoglycerates, or glycerophospholipids, are the most abundant phospholipids in cell membranes and contain a glycerol unit with fatty acids attached to the first two carbon atoms and a phosphoric acid unit attached to the third carbon atom of glycerol.