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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
Adenine is a purine, characterized by a two-ring structure, while thymine, cytosine, and uracil are pyrimidines.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Nucleic Acids - DNA RNA Structure and Functions
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