The cell membrane is , meaning that it’s picky about what it lets in and out. are scattered across the bilayer that help assist the membrane's job of allowing only certain substances in and out of the cell.
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The cell membrane is selectively permeable, meaning that it’s picky about what it lets in and out. Proteins are scattered across the phospholipid bilayer that help assist the membrane's job of allowing only certain substances in and out of the cell.