Biology Edexcel topic 1 b2 DNA

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  • Created by: dom
  • Created on: 24-03-13 17:55

DNA

its is a DOUBLE HELIX  of PAIRED BASES

a molecule of dna contains two strands held together by CHEMICALS  called bases

the four different bases include;

  • ADENINE
  • CYTOSINE
  • GUANINE
  • THYMINE

they are always paired and in the same way e.g A-T G-C by a weak HYDROGEN BOND.

How the structure of DNA was discovered

the 4 scientists involved; 

  • watson
  • crick
  • franklin 
  • wilkins

Franklin and Wilkins discovered the HELIX shape by directing beams on to CRYSTALLISED DNA and looking at…

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