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Nucleic acids

Why does a purine base always pair with a pyrimidine base?
Original post by Weronika_m
Why does a purine base always pair with a pyrimidine base?


I believe it's due to the way hydrogen bonds form between them. The variation in sizes between a purine's double ringed structure and pyrimidine's single ringed structure allow for the bonds to form in a particular way to fit the structure.
Reply 2
Original post by M0nkey Thunder
I believe it's due to the way hydrogen bonds form between them. The variation in sizes between a purine's double ringed structure and pyrimidine's single ringed structure allow for the bonds to form in a particular way to fit the structure.


Thank you!!

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