301. The Length of DNA Molecules (EXP-301)
Length of DNA EXP-301 DNA fragments of known lengths (lanes 1, 3, 5, and 7) and unknown length (lanes 2, 4, 6, 8) are separated by electrophoresis.
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Electrophoresis in agarose gels is the most common method used for determining the size of DNA molecules. In this introductory exercise, students determine the length of an unknown DNA molecule by comparing its electrophoretic mobility with six DNA molecules of known size as shown.