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Upon exposure to UV radiation, DNA stained with ethidium bromide will show
Bright red colour
Bright blue colour
Bright yellow colour
Bright orange colour
Answers (1)
The correct option is Option 4) Bright orange colour.
Ethidium bromide is a fluorescent dye commonly used to stain DNA and visualize it under ultraviolet (UV) light. When ethidium bromide binds to DNA, it intercalates between the base pairs of the DNA molecule.
When exposed to UV radiation, ethidium bromide emits a fluorescent signal that can be visualized. Under UV light, DNA stained with ethidium bromide typically appears as bright orange bands or spots.
The orange color is a result of the interaction between ethidium bromide and the DNA molecule. The intercalation of ethidium bromide into the DNA helix causes a shift in the absorbance and emission wavelengths, resulting in the characteristic orange fluorescence when exposed to UV light.
Therefore, Option 4) Bright orange colour is the correct option for how DNA stained with ethidium bromide appears when exposed to UV radiation.
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