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  4. Which of the following is a purine ?

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Q. Which of the following is a purine ?

Chhattisgarh PMTChhattisgarh PMT 2004

Solution:

Nitrogenous bases are of two types-purines and pyrimidines. Purines are $9$-membered double ring nitrogen bases, which possess nitrogen at $1, 3, 7$ and $9$ position, eg, adenine , guanine $(G)$. Pyrimidines are $6$-membered nitrogen bases that contain nitrogen at $1$ and $3$ positions, eg, cytosine , thymine $(T)$, uracil $(U)$.