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Adenine is

1. Purine
2. Pyrimidine
3. Nucleoside
4. Nucleotide

Correct answer: Purine

Solution

Adenine is a nitrogenous base with a fused double-ring structure, which places it in the purine class. Pyrimidines have a single-ring structure, while nucleosides and nucleotides are larger molecules built from bases plus sugar and phosphate.

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