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Identify the molecules in the plasma membrane that provide basic membrane structure, cell identity, and membrane fluidity.

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The main molecules present in the plasma membrane are phospholipids, those molecules are made of a polar, hydrophil end(glycerol with a phosphate group attached) and two non-polar, hydrophobe ends(two fatty acids rests). The cell identity is determined by proteins present in the membrane, a  very important type of protein that determines the identity of a specific cell is called marker. The membrane fluidity is reduced by a lipid with a ring structure, cholesterol, this molecule belongs to a class of biomolecules called steroids.

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