Question: 96. Upon exposure to UV radiation, DNA stained with ethidium bromide will show
(1) Bright yellow colour
(2) Bright orange colour
(3) Bright red colour
(4) Bright blue colour
Answer: Option (2)
Explanation:
Ethidium bromide is a fluorescent dye commonly used to stain DNA.
It intercalates between the base pairs of DNA molecules.
When DNA stained with ethidium bromide is exposed to ultraviolet radiation, the dye fluoresces.
This fluorescence appears as a bright orange colour.
Therefore, DNA stained with ethidium bromide shows bright orange colour under UV radiation.