The role of ethidium bromide in gel electrophoresis is that

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it induces a negative charge on all DNA strands

it makes DNA strands visible as orange coloured strips

it ensures separation of DNA strands on the basis of charge and mass

it removes the gel associated with DNA strands

answer is B.

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Detailed Solution

The separated DNA fragments can be visualised only after staining the DNA with a compound known as ethidium bromide followed by exposure to UV radiation. We can see bright orange coloured bands of DNA in a ethidium bromide stained gel exposed to UV light.

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