A nitrogenous base not present in RNA is

Uracil

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Thymine

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Guanine

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Cytosine

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Solution

The correct option is A Thymine
The nitrogenous bases are purines and pyrimidines. The purines are adenine and guanine. The pyrimidines are thymine and cytosine. In RNA, the thymine is replaced by uracil. It is mainly found in RNA. It is an ester of phosphoric acid with the nucleoside uridine.
So, the correct answer is option B.

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