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Nitrogenous base H-bonding ratios in tRNA vs rRNA ??

SStell
in Biochemistry and Molecular Biology

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Can anyone shed some light on the hydrogen bonding ratios for the bases in RNAs?

 

Why is there an 8 to 1 ratio for double (A-U) to triple bonds(G-C) in the transfer RNA and almost the exact opposite for the ribosomal RNA?

 

Are the triple bonds more stable AND more conserved evolutionarily?

 

Are the double bonds more flexible and tRNA does more flexing whereas the rRNA does less flexing?

Any speculation or links?

 

 

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