Biology 9700 · AS & A Level · Proteins

Proteins — practice question

The table lists the DNA triplet codes for several amino acids. The base sequence on the DNA strand that codes for a polypeptide is shown. $\text{CCA TTC ACG GCG TTA GCA}$ During DNA replication, two mutations take place in this sequence. Which mutated DNA would produce no change in the polypeptide synthesised?

  • A$\text{CCA ATC ACG GCG TTG GCA}$
  • B$\text{CCA TTC ACA GCA TTA GCA}$
  • C$\text{CCA TTC ACG CCG TTA GCC}$
  • D$\text{CCT TTC ACG GCG TTA GGA}$

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