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write about Plasma membrane.
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All cells are surrounded by a plasma membrane. The membrane is composed of a phospholipid bilayer arranged back-to-back. The membrane is also covered in places with cholesterol molecules and proteins. The plasma membrane is selectively permeable and regulates which molecules are allowed to enter and exit the cell.
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Plasma membrane :-:------>
it is also called cell membrane .
it first layer in animal cell and second most layer in plant cell .
it is flexible .
Function
it provide protection to the internal organ of body .
it is also called semipermeable membrane allow selective part to comes in our out .
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