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[ÇóÖú] separate the DNA fragments

If you would like to separate the DNA fragments ranging from 1 kb to 20 kb, what kind of
technique could be used? How do you determine the accurate size of an unknown DNA
molecule by this technique?
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Agarose gel electrophoresis can do the job.
By using the molecular-weight size marker (or ladder), you can identify the approximate size of the molecules run on the gel, because molecular weight is inversely proportional to migration rate through a gel matrix.
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