Biology 9700 · AS & A Level · Structure of nucleic acids and replication of DNA

Structure of nucleic acids and replication of DNA — practice question

Which row gives the correct properties of the nitrogenous base thymine?

  • Asingle ring: correct; purine: correct; forms two hydrogen bonds: not correct; pairs with cytosine: not correct
  • Bsingle ring: correct; purine: not correct; forms two hydrogen bonds: correct; pairs with cytosine: not correct
  • Csingle ring: not correct; purine: correct; forms two hydrogen bonds: not correct; pairs with cytosine: correct
  • Dsingle ring: not correct; purine: not correct; forms two hydrogen bonds: correct; pairs with cytosine: correct

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