Which of the following structures represents adenine?

Step-by-step solution

Adenine is a purine nucleobase with the chemical name 6-aminopurine. It consists of a bicyclic purine ring system (a six-membered pyrimidine ring fused to a five-membered imidazole ring) with an amino group ( -NH₂ ) attached at the C6 position. It does not contain any carbonyl ( C=O ) groups. Let us analyze the given structures: Option (A) represents Guanine, which is a purine derivative containing both an amino group and a carbonyl group. Option (B) represents Uracil, which is a pyrimidine derivative containing tw