Mark

DEFINITION/FUNCTION:a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell; "all cells have a cell membrane"

FOUND IN PLANT, ANIMAL, OR BOTH?: Both


FIND A PICTURE AND PUT HERE: cell_membrane.gif
(NOTE: you must SAVE the picture to your computer, then "Edit", "File", and select the picture to paste)