Diagram of a plasma membrane showing the modified fluid-mosaic model. The plasma membrane is a lipid bilayer consisting primarily of phospholipid molecules, cholesterol, and protein molecules. The hydrophobic fatty acid chains of phospholipids face each other to form the inner portion of the membrane, while the hydrophilic polar heads of the phospholipids form the extracellular and intracellular surfaces of the membrane. Cholesterol molecules are incorporated hydrophilic polar head peripheral proteins hydrophilic polar head carbohydrates peripheral proteins
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