Which one of the following pairs of the nitrogenous base of nucleic acids, is wrongly matched with the category mentioned against it?

Thymine, uracil - Pyrimidines

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Uracil, cytosine - Pyrimidines

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Guanine, adenine - Purines

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Adenine, thymine - Purines

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Solution

The correct option is D Adenine, thymine - Purines
The nitrogenous bases are of two types
Purines are heterocyclic and two ring compounds, e.g. Adenine, guanine.
Pyrimidines are single ring compounds, e.g. Thymine, cytosine, uracil.

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