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DNA has a negative electrical charge due to the phosphate groups on the DNA backbone. During electrophoresis DNA pieces move toward the. Virtual Gel Electrophoresis Virtual Gel Electrophoresis Genetic Science Learning Center At The University Of Course Hero When salt is added to the sample the positively charged sodium ions of the salt are attracted to the negative charges of the DNA neutralizing the electrical charge of the DNA. . DNA has a negative electrical charge due to the phosphate groups on the DNA backbone and the electrical charge makes it soluble. DNA exerts a negative charge due to the sugar-phosphate backbone of the nucleic acid chain. The length of a DNA molecule and its sequence of 4 nucleotides A T C and G can be readily modified and studies have shown that both alterations have an effect on how electrical charge moves. Electrophoresis works because DNA has a negative charge due to the _____ molecules in it...
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