I don't think that it is a coincidence that nucleic
acids absorb light strongly in the UV range, or that
they do so in this order (from most to least) A,G,U,C

"...bases and all of their derivatives (nucleosides,
nucleotides, and nucliec acids) absorb light strongly
in the near UV region of the spectrum..."
Biochemistry, van Holde, Matthews.

The text shows a chart of"UV Spectra of
Ribonucleotides or
what each of the 4 bases
absorbs, and where they absorb the most. Note the
order from highest absorption to lowest:
A - 260 nm
G - 250 nm.  then a noticeable drop

U - 260 nm
C - 270 nm.

Note that A and G are both purines. I have suggested
that perhaps a 'purine' world preceded the RNA world.
Note that U is the 3rd highest, and C the fourth.
I have also suggested that U may have been the first
to add to the purine world, and C the last to.

I can't say WHY there is a correlation between
absorption and the start of life. But I think this
and other factors hints that this is the right
direction to explore:

1. Life as a thermaldynamic system (with
replication a novel form of energy moderation)
2. Life is a reaction to the sun/heat cycle.
3. Ribonucleotides absorption of UV
4. Pyrimidine dimers that may have given
a  more stable advantage to the purines.
5. UV does the same as lightning in Miller-Urey
experiments.

Comment?
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