November 28, 2015

Homework Help: bio

Posted by Monique on Wednesday, March 21, 2012 at 10:37pm.

The cell membrane is a highly selective barrier that controls the movement of substances in and out of the cell. In fact, polar molecules are unable to go across unless

A. they are enclosed in water-filled vesicles.

B. they pass through channels in the cell membrane.

C. they are broken down into smaller pieces.

D. they react with other substances to become nonpolar.

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