What does it mean for a cell membrane to be selectively permeable?
(a) it allows some substan...
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What does it mean for a cell membrane to be selectively permeable?
(a) it allows some substances to pass through but blocks the passage of others.
(b) it allows molecules to pass through if they are under a certain size.
(c) it allows only water molecules to pass through.
(d) it blocks the passage of most substances.
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