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Kaplan Qbank USMLE



Author2 Posts
  #1

In the process of codon recognition by tRNA it is said that nontraditional base pairing takes place. It differs from traditional in two ways: 1 - U-G pairing occurs, and 2 - U,C,A nucleotides of mRNA are complementary to I nucleotide of tRNA. I assume that I states for one of "unusual" bases, which are quite common in tRNA. But which one? And where did it come from? Cannot get this information from books. Or may be I've got the whole picture wrong?
Thank you.

  #2

I found!
tRNA is truly very unusual. It has Thimine linked to a ribose sugar, it has all other bases being methilated, and finaly - I (inosine - their "parent").
It was easy.







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