Which from following nitrogen bases either of purine or pyrimidine does NOT contain − NH 2 group attached with its ring?

Question

Which from following nitrogen bases either of purine or pyrimidine does NOT contain − NH 2 ​ group attached with its ring?

TestHub · Accepted Answer

Adenine is 6-aminopurine, which contains an $- NH_{2}$ group attached to the purine ring.

Guanine is 2-amino-6-oxopurine, which contains an $- NH_{2}$ group attached to the purine ring.

Cytosine is 4-amino-2-oxopyrimidine, which contains an $- NH_{2}$ group attached to the pyrimidine ring.

Thymine is 5-methyl-2,4-dioxopyrimidine, which contains two oxo groups and a methyl group, but does not contain an $- NH_{2}$ group.

Answer: Thymine

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