NEET 2017 Biology question

DNA fragments are

(1)Positively charged
(2)Negatively chargedCorrect
(3)Neutral
(4)Either positively or negatively charged depending on their size

Answer: (2)

Solution

Every nucleotide of DNA carries a phosphate group, which makes the DNA backbone negatively charged irrespective of fragment size. Hence DNA fragments move towards the positive electrode

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Question ID VK-092139