bilayer; phospholipid membrane. In an aqueous environment phospholipids can form a two-layered "sandwich" with the hydrophobic lipid tails on the inside and the hydrophilic phosphate heads facing outward. These bilayers are the essential structure for building cell membranes.
A symmetrical two-layer structure formed by phospholipids in aqueous solution; the basic structure of all biomembranes. In a bilayer, the polar head groups are exposed to the aqueous medium, while the nonpolar hydrocarbon chains of the fatty acids are in the center.
the arrangement of phospholipid molecules in two parallel rows, in which the hydrophilic heads face outward & the hydrophobic tails face inward