Question

what is plasma membrane made up of why is the plasma membrane called selectively premable membrane

Answer 1

Plasma membrane is a outermost layer of the living cell. It is a bi-lipid layer,consisting of a few protein molecule. Plasma membrane is calledas a selectively permeable membrane, because it allows only certain molecule to pass through the cell membrane. like oxygen,carbon dioxide,minerals some protiens etc.

Answer 2

Plasma membrane is made up of lipids and proteins and thus is also called a lipo-protein membrane. It is called a selectively permeable membrane because it allows only the movement of some types of molecules inside and outside the cell.