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Question
Which of the following nucleotide bases is found only in DNA, not in RNA?
Options
Guanine
Adenine
Thymine
Uracil
MCQ
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Solution
Thymine
Explanation:
In the structure of nucleic acids, Thymine is the unique nitrogenous base that is found exclusively in DNA. While DNA and RNA share three common bases, Adenine, Guanine, and Cytosine, the presence of Thymine is one of the primary chemical markers that distinguishes DNA from RNA. In RNA, Thymine is replaced by Uracil, which performs a similar role by pairing with Adenine. Thymine's presence in DNA provides greater chemical stability and helps prevent mutations, making it more suitable for the long-term storage of genetic information.
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