Which of the following pairs of nitrogenous bases of nucleic acids is incorrectly matched with its category?

  • A
    Guanine,Adenine - Purines
  • B
    Adenine,Thymine - Purines
  • C
    Thymine,Uracil - Pyrimidines
  • D
    Uracil,Cytosine - Pyrimidines

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The chemical structure shown below is attached to which carbon atom of the pentose sugar?

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