Q.

The role of ethidium bromide in gel electrophoresis is that

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a

it induces a negative charge on all DNA strands

b

it makes DNA strands visible as orange coloured strips

c

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

d

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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The role of ethidium bromide in gel electrophoresis is that