Biochemistry All of the following are true about the structure of bases found in nucleotides, EXCEPT A Purine ring is nine-membered B Pyrimidine ring is six-membered C Purine and pyrimidine rings are heterocyclic in nature D Imino and lactim form of purine bases are more stable 💡 Explanation All of the following are true about the structure of bases found in nucleotides, EXCEPT ✓ Correct Answer: D. Imino and lactim form of purine bases are more stable