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Distinguish between the structure of pyrimidines and purines. explain why adenine bonds only to thymine.
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Distinguish between the structure of pyrimidines and purines. explain why adenine bonds only to thymine.

User Klmdb
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Pyrimidines have a single ring structure. Purines have a double ring structure. Adenine and thymine bind together as they’re complementary base pairs to one another, and form 2 hydrogen bonds upon binding
User Erik Kinding
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