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Nucleotides

DNA consists of the nucleotide bases:
  • Adenine (A)
  • Cytosine (C)
  • Guanine (G)
  • Thymine (T)
Base Paring Rules: G↔C, A↔T
A and G are purines (double‐ring), C and T are pyrimidines (single‐ring). The nucleotides in a base pair are complementary which means their shape allows them to bond together with hydrogen bonds. The A-T pair forms two hydrogen bonds. The C-G pair forms three hydrogen bonds.
RNA consists of the nucleotide bases:
  • Adenine (A)
  • Cytosine (C)
  • Guanine (G)
  • Uracil (U)
Base Paring Rules: G↔C, A↔U
A and G are purines (double‐ring), C and U are pyrimidines (single‐ring).