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5.1.1. Components of nucleic acids

Components of nucleic acids

The nucleic acids are large polymers formed by the repetition of monomers called nucleotides , linked by phosphodiester bonds. There are two basic types, DNA and RNA .

The nucleotides are formed by a phosphoric acid (H3PO4) linked to ribose or a deoxyribose, and this to a nitrogenous base. If the phosphate group is missing, it is called a nucleoside .

Nitrogen bases can be:

  • Puric bases: Adenine, Guanine.
  • Pyrimidine bases: Cytosine, Thymine and Uracil.

By Calibuon at English Wikibooks [Public domain], via Wikimedia Commons

By Alejandro Porto [CC BY-SA 3.0], via Wikimdia Commons