Which of the following are purine bases?
1. Guanine
2. Adenine
3. Thymine
4. Uracil
(a, b)
Purines consist of six-membered and five-membered nitrogen-containing ring fused together.
Guanine and adenine are purine bases whose structures are
While thymine and uracil are pyrimidene bases
Hence (a) and (b) are correct choices.
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