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DNAs when charged, migrate in a gel towards the

  • A.positive pole
  • B.negative pole
  • C.will not migrate
  • D.none of these

Answer: A

Correct answer: positive pole

Every phosphate in the backbone carries a negative charge at the pH of the buffer, so DNA is uniformly negative regardless of sequence. In an electric field it therefore migrates towards the anode - the positive pole. The uniform charge-to-mass ratio is also why the gel separates fragments purely by size.

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