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

1. Thymine, Uracil - Pyrimidines
2. Uracil, Cytosine - Pyrimidines
3. Guanine, Adenine - Purines
4. Adenine, Thymine - Purines

Correct answer: Adenine, Thymine - Purines

Solution

Adenine is a purine, but thymine is a pyrimidine, so the pair cannot both be purines. The other options correctly group pyrimidines (thymine, uracil, cytosine) and purines (adenine, guanine).

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