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Nucleotides and Nucleosides

Question

A nitrogenous base not present in RNA is
Thymine
Cytosine
Guanine
Uracil

A

Thymine

B

Guanine

C

Uracil

D

Cytosine

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Solution

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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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