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In DNA, adenine pairs with thymine via two hydrogen bonds, following base-pairing rules.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Nucleic Acids - Structure - Nucleotides, Sugars and Base Pairing
Adenine pairs with thymine in DNA via two hydrogen bonds, contributing to the double helix stability.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Nucleic Acids - Structure - Nucleotides, Sugars and Base Pairing
Adenine and thymine form two hydrogen bonds in DNA, contributing to base pairing stability.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Nucleic Acids - Structure - Nucleotides, Sugars and Base Pairing
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
DNA contains thymine, whereas RNA contains uracil instead of thymine.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Nucleic Acids - DNA RNA Structure and Functions
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.
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