Biology 9700 · AS & A Level · Replication and division of nuclei and cells

Replication and division of nuclei and cells — practice question

The table lists several DNA triplet codes for certain amino acids. arginine: GCA, GCC, GCG asparagine: TTA, TTG cysteine: ACA, ACG STOP: ATC glycine: CCA, CCG, CCT lysine: TTC, TTT proline: GGA, GGC valine: CAC A section of the template DNA strand that codes for part of a polypeptide is shown below. CCA TTC ACG GCG TTA GCA During DNA replication, two mutations take place in this sequence. Which mutated DNA would produce two different amino acids?

  • ACCA ATC ACG GCG TTG GCA
  • BCCA TTC ACA GCA TTA GCA
  • CCCA TTC ACG CCG TTA GCC
  • DCCA TTC ACG GCG TTC GGA

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