Definition of Lipid Bilayer

A lipid bilayer is a biological membrane that consists of two layers of lipid molecules. This lipid bilayer is a primary part of all cellular membranes. The lipid molecule has two regions i.e. head and tail. The head region of a lipid molecule is hydrophilic (water-attracting) and the tail is hydrophobic (water-hating) in nature.


The tails are congregated inside the structure of the bilayer and make it non-polar and the heads are exposed on the surface and make it polar and help in the formation of hydrogen bonds with other surrounding polar molecules. In this way, the layer allows selective substances to cross it, and consequently, a stable and ideal environment can be created for the biochemical reactions to occur.

View More Organic Chemistry Definitions