What are lipids in the context of cell membranes?

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In the context of cell membranes, lipid molecules are crucial as they form the fundamental structure of the membrane itself. The term "double layer of lipid molecules" refers to the phospholipid bilayer, which is a central component of all cellular membranes. Phospholipids have hydrophilic (water-attracting) heads and hydrophobic (water-repelling) tails. This unique arrangement allows the lipids to organize themselves into a bilayer, with the hydrophilic heads facing outward towards the aqueous environment on both sides of the membrane, while the hydrophobic tails face inward, away from water.

This configuration is essential for creating a semi-permeable membrane that regulates the passage of substances in and out of the cell, contributing to essential functions such as cell signaling, nutrient uptake, and waste removal. Thus, the correct answer highlights the structural role of lipids in forming the cellular barrier that delineates the cell's interior from its external environment.

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