Identify the nitrogenous bases of the purine and pyrimidine types.

  • A
    Purine $= C, T, U$; Pyrimidine $= A, G$
  • B
    Purine $= G, C, U$; Pyrimidine $= A, T$
  • C
    Purine $= A, T$; Pyrimidine $= G, C, U$
  • D
    Purine $= A, G$; Pyrimidine $= C, T, U$

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