Why phospholipids form membranes

the primary function of phospholipids is to form the lipid bilayer that is characteristic of all cellular membranes. >phospholipid bilayers are selectively. Phospholipid. • Single chain lipids were assumed to be the first of those to form cell membranes with the more complex phospholipids evolving later. phospholipid head is charged making it hydrophilic. This amphipathic nature allows for the bi- layer to form with the hydrophobic tails turning inwards away.