The cellular compartment of all eukaryotes is bounded by a membrane called cell/plasma membrane. The membranes in cells are similar in structure and majorly composed of phospholipids that builds it.
The phospholipid component are arranged in two adjacent layers in biological membranes, hence, called phospholipid bilayer. The phospholipid bilayer is said to be AMPHIPATHIC because it contains two hydrophobic fatty acids and a hydrophilic phosphate head in its structure. This amphipathic nature of the cell membrane confers semi-permeability of substances upon it.
