Five nitrogen atoms are present in the ring o | vedclass

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(B) The nitrogenous bases are classified into two types: purines and pyrimidines.Purines (Adenine and Guanine) consist of a double-ring structure cont

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Guanine

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(B) The nitrogenous bases are classified into two types: purines and pyrimidines.Purines (Adenine and Guanine) consist of a double-ring structure containing four nitrogen atoms in the rings.However,Guanine specifically has an additional nitrogen atom in its amino group or side chain,but the question asks for the ring structure. Actually,looking at the molecular structure of Guanine $(C_5H_5N_5O)$,it contains five nitrogen atoms in total,with four nitrogen atoms forming part of the fused heterocyclic ring system (a pyrimidine ring fused to an imidazole ring).Uracil,Cytosine,and Thymine are pyrimidines,which contain only two nitrogen atoms in their single-ring structure.Therefore,Guanine is the correct answer as it contains five nitrogen atoms.

Five nitrogen atoms are present in the ring of

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