Nucleic Acid Structure and General Features

ID #2155

I have a question about numbering the ring structures. As far as I know we are only supposed to number the carbons in a ring structure, but when I looked at the Lecture 7 notes one of the diagrams shows the "N" of the nitrogenous base labeled as number 1. I am wondering why this is the case?


In  an earlier lecture we discussed how to number carbons in a monosaccharide. Nitrogenous bases also use a similar convention of numbering the core atoms, which in this case are both the nitrogens and the carbons. In the case of nucleotides, which contain both nitrogenous bases and monosaccharides, we start with 1 in the same place: on the conventionally drawn picture, this is the upper right most carbon (or nitrogen in the case of the bases).

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