What is the relationship between the concentration of the gel and the size of the DNA fragments that are separated? this is refering to the agarose gel

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Gel electrophoresis is a way for separating mixtures of DNA, RNA, or proteins by moving the various molecules through a gel subjected to an electric field.  The gel is made of porous polymers.  The more concentrated the gel is, the more tightly packed the polymers are and the smaller the pore...

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Gel electrophoresis is a way for separating mixtures of DNA, RNA, or proteins by moving the various molecules through a gel subjected to an electric field.  The gel is made of porous polymers.  The more concentrated the gel is, the more tightly packed the polymers are and the smaller the pore size is between the molecules.  This makes it more difficult for larger chemicals to pass through the gel.  So the relationship is that the more concentrated the gel is, the shorter the distance the various molecules pass through the gel.  The larger molecules pass a relatively shorter distance and the smaller molecules pass a relatively longer distance.

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