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Given that nucleic acids, like DNA and RNA, absorb light why are they not considered pigments?

I need help answering this question for a Biology homework assignment--any help would be appreciated!!

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Materials that absorb light are pigments if that is their primary function. A pigment absorbs certain wavelengths of light, and reflect others. Their "color' is define by the colors that they reflect, not the colors or wavelengths they absorb. This is a negative color scheme... Lights are an additive color scheme.
A pigment's primary purpose is to adsorb wavelengths and reflect wavelengths, and may have no other chemical or reproductive function.

However, you might be able to determine the relative amounts of DNA and RNA in a mixture by the wavelengths that are adsorbed. This is the basis of spectrometry. That's how many elements and materials are found in unknown mixtures.

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Nucleic acids like DNA and RNA are not considered to be pigments because that is not their linear function. Pigments absorbs light with different wavelength within selective regions of the visible spectrum. Nucleic acids absorb light in the ultraviolet range.

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