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Nonpolar lipids, specifically phospholipids, make up the majority of the cell membrane. These molecules consist of a hydrophilic (water-attracting) "head" and two hydrophobic (water-repelling) "tails," allowing them to form a bilayer that serves as a barrier to polar substances. This nonpolar nature is crucial for maintaining the integrity and fluidity of the membrane, enabling it to regulate the movement of substances in and out of the cell.

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1mo ago

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What part of cell controls movement of molecules in and out of cell?

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