Cell membranes are said to be selectively permeable. which statement best explains what selectively
permeable means?
(1) the cell membrane prevents any harmful substance from entering the cell.
(2) the cell membrane lets certain substances enter the cell and keeps certain substances out of the cell.
(3) the cell membrane allows only large molecules to diffuse into the cell.
(4) the cell membrane has pores that let only water and glucose into the cell and carbon dioxide out
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