Which of the following is not a purine?

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(D) Nucleic acids contain two types of nitrogenous bases: purines and pyrimidines.$1$. Purines include $Adenine$ and $Guanine$.$2$. Pyrimidines includ

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Cytosine

Vedclass · Answer

(D) Nucleic acids contain two types of nitrogenous bases: purines and pyrimidines.$1$. Purines include $Adenine$ and $Guanine$.$2$. Pyrimidines include $Cytosine$,$Thymine$,and $Uracil$.$Caffeine$ is a xanthine alkaloid,which is a derivative of purine,but it is not one of the standard nitrogenous bases found in nucleic acids.However,among the given options,$Cytosine$ is a pyrimidine,not a purine. Therefore,$Cytosine$ is the correct answer as it is a pyrimidine.

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