The DNA double helix.

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BC10M 2006 Lecture 20 Nucleic acids, Nucleotides
their bases.
The DNA double helix. The most common form of
genetic material.
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3'
5'
Complementary basepairing the strands are
antiparallel.
The numbers three primed five primed refer to
the carbon atoms of the deoxyribose.
5'
3'
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Purines Pyrimidines
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• Functions of nucleotides
• Monomers of polynucleotides (a.k.a. nucleic
  acids)
• Suppliers of Gibbs free energy to endergonic
  reactions (ATP etc. GTP)
• Priming monomers in polymerisation reactions
  (UDP-sugars CMP lipids AMP-amino acids)
• Enzyme binding handles for coenzymes (NAD(P)
  CoA FAD etc.)
• Metabolic regulators (cAMP cGMP)

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Vit B12
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