It’s considered a weak acid. And by acid we mean it disassociates ever so slightly into hydrogen ions (protons) and its base (everything else) in aqueous solution. Because you don’t want DNA to be very reactive with just anything, this is as far as its acidity goes. It seems to be just enough. If it was capable of protonating all sorts of s##t like, say, fluoroantimonic acid, it would be very unstable and unsuitable for genetic storage. But biochemistry happens in solution, and pretty much everything is an acid/base at that point.
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