UPSC NDA I 2012 General Ability Paper

Question : 89 of 150

Marks: +1, -0

Cell membrane is selectively permeable because

it is made up of selected organic molecules
it does not allow transport of some substances from region of higher concentration to the region of lower concentration
the movement of organic molecules occurs only at specific concentration
it allows the movement of certain molecules in and out of the cell while the movement of other molecules is prevented

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