Discuss the role of lipids in biological membranes and their importance in maintaining cellular integrity.

Lipids play a fundamental role in the structure and function of biological membranes, serving as essential components that maintain cellular integrity. Biological membranes, primarily composed of lipids, proteins, and carbohydrates, act as selective barriers that regulate the movement of molecules in and out of the cell. The amphipathic nature of lipids, consisting of hydrophilic (polar) heads and hydrophobic (nonpolar) tails, enables the formation of the lipid bilayer, which is the foundational structure of all cellular membranes.

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