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Question

The wavelength of ultraviolet light absorbed by nucleic acid is

A

26 nm

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B

75 nm

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C

260 nm

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D

1500 nm

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Solution

The correct option is A 260 nm
The range of absorption of nucleic acid is 240 to 275 nm. It shows maximum absorption at 260 nm. The bases can be protonated, and therefore the spectra of DNA and RNA are sensitive to pH.
So, the correct answer is option C.

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