Nucleic Acid Structure and General Features

ID #1064

In terms of the nucleotide bases and the two types (pyrimidine and purine) how can you tell by looking at them which one is which? I thought I understood by looking at the notes the difference in their appearance but I was confused by a reference to a purine later on in lecture 9. I feel like there is something simple that distinguishes them but I'm not sure what it is.

Yes, this one's really easy -- a purine has a double ring structure and a pyrimidine has a single ring structure.  You will, however, have to learn which bases are purines and which are pyrimidines, and which you find in RNA versus DNA.

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