NEET Biology question

Which of the following steps should be performed by a person in order to visualize the bands of DNA fragments obtained from gel electrophoresis?

(A)Exposure of DNA fragments to UV radiations.
(B)Staining with bromophenol blue followed by exposure to UV radiations.
(C)Staining with ethidium bromide followed by exposure to UV radiations.Correct
(D)A person can see the bands without staining.

Answer: (C)

Solution

DNA bands are invisible without staining, bromophenol blue is only a loading-dye tracker (not a DNA-visualizing stain), and UV exposure alone cannot reveal unstained DNA,

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Question ID VK-125227