NEET 2023 Phase 1 · BiologyPrevious Year Question
Upon exposure to UV radiation, DNA stained with ethidium bromide will show
Answer: (D) Bright orange colour. Answer: (D) Bright orange colour Solution: DNA fragments separated on an agarose gel cannot be seen in visible light.
- A.Bright red colour
- B.Bright blue colour
- C.Bright yellow colour
- D.Bright orange colour✓
Correct Answer
(D) Bright orange colour
Solution & Explanation
Answer: (D) Bright orange colour Solution: DNA fragments separated on an agarose gel cannot be seen in visible light. They are stained with ethidium bromide and then exposed to UV radiation, under which the DNA appears as bright orange coloured bands. Red, blue and yellow are not the colours described by NCERT. NCERT Reference: Ch 9, p.168, line(s) 23-24 — "You can see bright orange coloured bands of DNA in a ethidium bromide stained gel exposed to UV light"
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