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STD 12 - 9. biotechnology principlas and process — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 9. biotechnology principlas and process1 Mark
MCQ
Upon exposure to UV radiation, DNA stained with ethidium bromide will show
  • ✓
    Bright orange colour
  • B
    Bright red colour
  • C
    Bright blue colour
  • D
    Bright yellow colour
✓

Answer

Correct option: A.
Bright orange colour
a
Option $(1)$ is the correct answer because in recombinant $DNA$ technology the separated $DNA$ fragments can be visualised only after staining the $DNA$ with a substance known as ethidium bromide followed by exposure to $U.V.$ radiation. You can see bright orange coloured bands of $DNA$ in an ethidium bromide stained gel exposed to $U.V.$ light.

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