What positions in the ring of a purine nucleotide in DNA have the potential to form hydrogen bonds but are not involed in watson-crick base pairing?

All nitrogen positions in purine rings (N-1, N-3, N-7 and N-9) have the potential to form hydrogen bonds. Among them, only N-1 is involved in Watson-Crick base pairing hydrogen bond with a pyridimine. N-3 and N-7 are available to form further hydrogen bonds and N-9 is involved in a N-glycosyl linkage with a desoxyribose.

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luisvaschetto luisvaschetto · Answer 2 · 2022-04-05T13:34:37+02:00

The positions in the ring of a purine nucleotide in DNA that do NOT involve Watson-crick base-pairing include N-3 and N-7.

What is base pairing?

Base pairing refers to the exact match between pairs of nucleotides in a double helix DNA molecule.

According to base pairing, Adenine pairs with Thymine, and Guanine pairs with Cytosine.

Base pairing is produced by specific hydrogen bonds between pairs of nucleotides.

In conclusion, the positions in the ring of a purine nucleotide in DNA that have the potential to form hydrogen bonds but they are not involved in Watson-crick base pairing are N-3 and N-7.

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