The cell membrane separates the interior of cells from the housed environment. In humans and all eukaryotes, cell membranes are composed of a phospholipid bilayer. This allows membranes to be selectively permeable to ions and organic molecules and control their movement in and out of cells.
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eukaryote - any cell or organism that possesses a clearly defined nucleus, unlike bacteria. Eukaryotes include yeast, fungus, plants, and animals.