Q.One purine base from nucleic acid
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Start your 14-day free trial to unlock the full solution →Step 1. Section 14.4.1 identifies exactly two purine-derived bases among the five nitrogen bases of nucleic acids: adenine and guanine, both built on the fused bicyclic purine ring skeleton (a six-membered ring fused to a five-membered ring, sharing an edge, with four nitrogen atoms in the two rings, numbered around the bicyclic system from 1 to 9, per Fig. 14.25).
Step 2 (adenine option). Draw the purine bicyclic skeleton and add a single -NH2 (amino) substituent at ring-position C-6; label the structure adenine, symbol A.
Step 3 (guanine option, alternative answer). Draw the same purine bicyclic skeleton, but add a ring C=O (carbonyl) at C-6 and an -NH2 substituent at C-2; label the structure guanine, symbol G. …
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