Gene expression Qs

•   Suggest one reason why the genetic code is often shown as mRNA codons rather than DNA triplets

  • dna has 2 strands eahc with a different complementary base
  • ribosomes assemble polypeptide using mRNA codons
• suggest the role of mRNA codons UGA, UAG

   

  • they stop translation
  • result in detatchment from the polypeptide chain from ribosome