Which of the following nitrogenous base is absent in RNA?

Guanine

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Adenine

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Uracil

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Thymine

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Solution

The correct option is D Thymine
Adenine, guanine and cytosine are common nitrogenous bases present in both DNA and RNA. While thymine is present only in DNA. RNA has uracil instead of thymine.
Guanine always binds with cytosine by hydrogen bond. Adenine forms a hydrogen bond with a thymine in DNA and with a uracil in RNA.
So, the correct option is 'Thymine'.

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