question_answer 19)

  In agarose gel electrophoresis, DNA molecules are separated on the basis of their (a) charge only                  (b) size only                        (c) charge to size ratio    (d) All of these

Answer:

                  (b) In agarose gel electrophoresis, the DNA fragments separate out (resolve) according to their size or length because of the sieving property of agarose gel. It means, the smaller the fragment size, the farther it will move.