Answer :
With few exceptions, cellular membranes — including plasma membranes and internal membranes — are made of glycerophospholipids, molecules composed of glycerol, a phosphate group, and two fatty acid chains.
The cell membrane (also known as the plasma membrane (PM), cytoplasmic membrane, or plasmalemma) is a biological membrane that separates and protects the inside of all cells from the outside world (the extracellular space).
The cell membrane is a lipid bilayer composed of two layers of phospholipids with cholesterols (a lipid component) interspersed between them, which maintains adequate membrane fluidity at different temperatures.
Membranes also contain membrane proteins, which include integral proteins that span the membrane and act as membrane transporters, as well as peripheral proteins that loosely attach to the cell membrane's outer (peripheral) side and act as enzymes to facilitate interaction with the cell's environment.
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