Word Count : 250

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Biological membranes are dynamic structures whose permeability and function are strongly influenced by their lipid composition. The relative proportions of phospholipids, cholesterol, glycolipids, and fatty acid chains determine membrane fluidity, thickness, and selective permeability. Phospholipids form the basic bilayer, with hydrophilic heads facing outward and hydrophobic tails inward. The length and degree of saturation of fatty acid chains are crucial; membranes rich ______ __________ _________ _________ _________ _______ ________.
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