Q.

The base that is not present in RNA

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a

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b

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c

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d

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answer is D.

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Detailed Solution

 The nitrogenous base uracil is absent in DNA. Uracil is a pyrimidine present in RNA that has the similar structure as thymine in DNA In RNA, the thymine is replaced by uracil. Structure 4 is thymine.

Hence the correct answer is (D).

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The base that is not present in RNA