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Biology Stops Essay

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Date:   10/14/2013  1. What types  of  molecules  have  difficulty  crossing  the  plasma  membrane?  Explain  why.    Large polar molecules and ions cannot cross plasma membranes easily, because the inner hydrophobic section of the membrane impedes the movement of these molecules.  

2. What does  the  term  concentration  gradient  mean?  Concentration that exists between two different areas  
 3. A  solution  of  1M  glucose  is  separated  by  a  selectively  perm...

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