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Purine bases in nucleic acids include adenine and guanine; guanine is present in both DNA and RNA.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Nucleic Acids - Structure - Nucleotides, Sugars and Base Pairing
Thymine, a pyrimidine base in DNA, has a methyl group (-CH₃) attached to its ring structure.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Nucleic Acids - Structure - Nucleotides, Sugars and Base Pairing
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