Answers

2014-07-27T15:17:04+05:30
It allows the permeability of only selective materials into the cell and obstructs the others
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it stops the entry of toxic substances and keeps the cell healthy
2014-07-27T15:20:36+05:30

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The advantage is that the bigger & toxic molecules are prevented from entering the cell which might be potentially very harmful for the cell.
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