Which base is found in RNA but not in DNA?
Uracil is found in RNA, whereas DNA contains thymine instead of uracil.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance Regulation of Gene Expression - Lac Operon
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Which nitrogenous base is present in DNA but absent in RNA?
Thymine is present in DNA, whereas uracil replaces it in RNA.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance DNA Structure Double Helix and Packaging - Nucleosome
Which nitrogenous base is found in RNA but absent in DNA?
Uracil replaces thymine in RNA, whereas thymine is present in DNA.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Nucleic Acids - DNA RNA Structure and Functions
Which nitrogenous base is found only in RNA?
Uracil is the scientifically accurate answer to this question. Within the study of Nucleic Acid, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Uracil directly address what is being asked. Among the other options, Thymine, Cytosine, and Guanine do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Campbell Biology, Urry et al., 12th Ed.
The difference between uracil and thymine is:
Thymine has an additional methyl group accurately describes the key difference, similarity, or comparative feature asked about in this question. In Nucleic Acid, the ability to compare and contrast related concepts is essential for deeper understanding. The distinguishing feature described by Thymine has an additional methyl group reflects fundamental differences in structure, function, mechanism, or origin between the compared entities. The other options (Uracil has an additional hydroxyl group, Thymine lacks a nitrogenous ring, and Uracil has a sulfur group) either state incorrect comparison
Ref: Campbell Biology, Urry et al., 12th Ed.
