CELL MEMBRANE
    A:  The cell membrane is one of the organelles of a cell.  Mammalian cells contain a nucleus surrounded by a nuclear membrane and the cytoplasm surrounded by a cell membrane.  The cell membrane determines what can enter or leave the cell.  Not all molecules can enter or leave cells.  Thus, cell membranes are known as selectively permeable or semi-permeable membranes.

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This page was created by Patrick Ireland.
It was last updated January 20, 2000

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