structure of DNA

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1. How does cytosine differ to Thymine?

  • cytosine contains NH2 group on 4th carbon & has 2 double bonds
  • cytosine contains NH2 group on 5th carbon and has 2 double bonds
  • cytosine has NH2 group on 5th carbon only
  • thymine has NH2 group on 4th carbon and has 1 double bond
  • thymine has NH2 group on 4th carbon and has 2 double bonds
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2. what type of base is Adenine

  • Purine
  • Pyrimadine

3. how does adenine differ to guanine?

  • adenine contains NH2 on 6th carbon, guanine has CO group on 6th carbon
  • guanine contains NH2 on 6th Carbon, adenine has CO group on 6th carbon

4. what bonds hold base pairs together

  • phosphodiester linkages
  • covalent bonds
  • Hydrogen bonds
  • glycosidic bonds

5. who identified the structure of DNA

  • MacLeod &McCarty
  • Hershey & Chase
  • Watson & Crick
  • Friedrich Miescher

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