My hypothesis: Since nucleic acids has a peak absorbance at 260nm wavelength and proteins at 280nm, the ratio of greater than 2.0 is considered relatively pure RNA.

Twist: However, literature indicates that 260/280 ratio for relatively pure RNA is approximately 2.0. (What about having 2.4 or 2.5?)

Other concern: could a > or = to 2.0 also indicate purity from DNA contamination?

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