NEET 2008 Biology question

Gel electrophoresis is used for

(1)Isolation of DNA molecule
(2)Cutting of DNA into fragments
(3)Separation of DNA fragments according to their sizeCorrect
(4)Construction of recombinant DNA by joining with cloning vectors

Answer: (3)

Solution

In gel electrophoresis, DNA (negatively charged) fragments are loaded in an agarose gel and move towards the anode under an electric field; smaller fragments move farther through the gel matrix, so the fragments

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Question ID VK-090119