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Nucleic acids, lipids, and carbohydrates questions


An organic molecule has been isolated from the nucleus of a human cell. Nuclear magnetic resonance studies reveal the core structure of the molecule to be a six-membered ring containing carbon and nitrogen. The ring also expresses an amine group and a keto group, and is attached to a five carbon sugar moiety. No phosphate groups are noted. What is the most likely identity of the molecule?
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