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Plasma MembraneEssay title: Plasma MembraneAP Biology9/14/01Plasma MembraneThe fluid mosaic of a plasma membrane is made up of a semi permeable double barrier of phospholipids called a bilayer. A phospholipid is a phosphorus element with two fatty acids acting as tails. Due to the hydrophilic property of phosphorous, and the hydrophobic property of the fatty acids,.