What does it mean to say that the plasma membrane is "selectively permeable"?

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    It allows some substances to pass through it and keeps others out.
    It allows everything to enter but is selective about what leaves.
    It is selective about what enters but will allow everything to leave the cell.
    The membrane is selectively permeable only during the day.
    The membrane is selectively permeable only during the night.
asked May 27, 2013 in Anatomy & Physiology by anonymous
    

1 Answer

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It allows some substances to pass through it and keeps others out.
answered May 28, 2013 by NewSky ~Expert~ (2,450 points)

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