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The plasma membrane is an outer boundary and functional "traffic-cop" of every biological cell. Just like the outer layers of multicellular organisms, 13 Dec 2004 All living cells have a plasma membrane that encloses their contents. In prokaryotes, the membrane is the inner layer of protection Definition and other additional information on Plasma membrane from Biology- Online.org dictionary.The plasma membrane (cell membrane) is made of two layers of phospholipids. The plasma membrane regulates what enters and leaves the cell. Gram-negative bacteria have plasma membrane and outer membrane separated by the periplasmic space. Other prokaryotic species have only plasma membrane .
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