give chemical nature of plasma membrane?

Plasma membrane is made up of a two layers . This bilayer is composed of two layers of lipids (consists mostly of phospholipids and to a smaller extend of glycolipids). Glycolipids are generally found in the outside layer, whereas phospholipids are predominantly in the inside layer (cytoplasmic side). The other important component of the plasma membrane is protein. Proteins can be associated with the outside (peripheral) of the membrane or they extend throughout the entire membrane (transmembrane).  Plasma membrane has 50-50% of both lipids and proteins.

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The Plasma Membrane (formerly known as the cell membrane) forms the border of a neuron and acts to control the movement of substances into and out of the cell. This membrane is composed of two layers of lipid or fat molecules (phospholipids, in particular), with the water-repelling tails of these molecules directed toward the middle of the membrane and away from the fluid found outside and inside the cell. The water-attracting heads of the phospholipid molecules, therefore, are found in contact with extra- and intracellular fluid. Protein molecules are embedded within this bi-lipid membrane. Channel proteins serve as channels for controlling the rate of transport of specific molecules across the plasma membrane. Signal proteins respond to the binding of specific substances (often hormones) by sending messages into the cell to activate particular cellular mechanisms. Plasma membrane is made of organic molecules called lipds and proteins

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