Which base is found in RNA but not in DNA?
Uracil is present in RNA, replacing thymine, which is exclusive to DNA.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Nucleic Acids - Structure - Nucleotides, Sugars and Base Pairing
#DNA vs RNA
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Which base is present in DNA but not in RNA?
DNA contains thymine, while RNA contains uracil instead of thymine, alongside adenine, guanine, and cytosine.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Nucleic Acids - Structure - Nucleotides, Sugars and Base Pairing
The presence of a 2'-OH group in RNA makes it:
Less stable than DNA is the accurate classification or categorization for the organism, molecule, or concept described in this question. In Nucleic Acid, proper classification is based on shared characteristics including morphological, biochemical, genetic, and evolutionary criteria. Less stable than DNA meets the specific diagnostic features and defining criteria that distinguish it from related groups. The other options (More stable than DNA, Equally stable as DNA, and More hydrophobic) belong to different taxonomic groups, represent different classification levels, or possess distinct characteristics that exclude them from this category.
Ref: Campbell Biology, Urry et al., 12th Ed.
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.