Nitrogen bases

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  • Purines – 2 double rings
  •   -ADENINE 
  •  – GUANINE
  • Pyrimidines – 1 ring

Thymine

        – cytosine

  •  Order of bases contains the ‘code’ to make proteins
  • In a DNA molecule it must be made of a purines and a pyrimdines which makes it an exact length g if it was 2 purines it would be too long and if it was 2 pyrimidines it would be too short!
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