Cell membrane

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Drawing of a cell membrane
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Drawing of a cell membrane

Cell membrane is a thin flexible barrier around cells of organisms. This controls the chemicals entering and leaving the cell. It is made up of a thin film called the lipid bilayer. The lipid bilayer is two lipid molecules with polar heads and nonpolar tails facing away from each other. This prevents large molecules from entering, but still allows the small molecule of water to enter.

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