<< The stem end ends with ATP that connects that base to the amino
acid. >>


This is interesting. Note that the acceptor stem is always CCA

With CC together , 2 pyrimidines,
there is danger of UV damage causing a dimer that would prevent this stem from
base pairing. 

But maybe that was a selected advantage. If it could not base pair, then you
would always be guaranteed a single strand sticking out at lease 3 bases.
Just right for connecting to an amino acid.

And perhaps the A that ends the stem (CCA) is formerly an ATP to help join the
tRNA type stem to an amino acid in some primitive way.

Comment?
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 * RIMEGate(tm)V10.2áÿ* RelayNet(tm) NNTP Gateway * MoonDog BBS
 * RgateImp.MoonDog.BBS at 6/7/04 10:22:28 PM