Purines and pyrimidines exist in two tautomeric forms (lacta… Post author By Anonymous Post date April 7, 2025 Related Posts:Purines and pyrimidines exist in two tautomeric…Purines and pyrimidines exist in two tautomeric…Pyrimidines and purines can exist in alternate… ← What does the dragon symbolize in the poem? → What is a common kenning used for the sea in Beowulf?