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2. How is uracil different to Thymine?

  • thymine contains methyl group on 5th carbon
  • uracil contains methyl group on 5th carbon
  • thymine contains methyl group on 3rd carbon
  • thymine contains NH2 on 4th carbon

3. what bonds hold base pairs together

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

4. what type of base is Cytosine

  • Pyrimadine
  • Purine

5. In what year did Rosalind Franklin identify the double helix of DNA

  • 1956
  • 1856
  • 1953
  • 1952
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