Question
Explain how membrane lipid composition influences membrane fluidity and cellular function.
Answer :
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Membrane lipid composition plays a critical role in determining membrane fluidity, which directly affects cellular structure, signaling, transport, and survival. Biological membranes are primarily composed of phospholipids, cholesterol, and glycolipids. The arrangement and types of these lipids determine how tightly or loosely molecules pack together, thereby influencing the flexibility and permeability of the membrane. Fatty acid chains in phospholipids are a major determinant of fluidity. Saturated fatty acids have straight chains that pack closely together, making membranes more rigid and less fluid. In contrast,
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