I suggest that slightly before the RNA world there was a
world that consisted of
1. mostly purine RNA strands (dimers ruled out most
pyrimidine coding) and
2. mostly hydrophilic amino acids.
And it was because both of these groups were far in the
majority of molecules present, that there developed a
purine/hydrophilic world where mostly purine codons (for
numerous reasons as mentioned elsewhere)
were matched with mostly hydrophilic amino acids.
"Biological chemistry is wet chemistry. Most of the chemical
reactions that occur in life involve solutes dissolved in
water." Strickberger.
Thus if correct this better defines part of the RNA world
development.
Comment?