Step-by-Step Solution
Nitrogen bases have two primary divisions; one division represents pyrimidine another division represents purine bases. The adenine (A) base is categorized under purine and thymine (T) is considered among the pyrimidine group.
Purine is a derivative of pyrimidine. It consists of a pyrimidine ring and a five membered imidazole ring (having nitrogen at 7 and 9 positions), which are fused together at 5 and 4 positions. There are two purine compounds, namely adenine (A) and guanine (G).
It is very clear to identify CN (carbon-nitrogen) bonded through double bonds in the aromatic ring. These double bonds are resonating continuously. The cyanide molecules are shown clearly in the diagram below.
Figure: The cyanide molecules
4 molecules of HCN (hydrogen cyanide) condense to form 2, 3-diaminomaleonitrile, which then isomerizes to form a ring cyclic structure. Another molecule of HCN condenses with this ring to form adenine nucleotide.
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