9700/11 Biology Oct Nov 2017 Online Test | Cambridge AS and A Level MCQ
Part of the amino acid sequences in normal and sickle cell haemoglobin are shown.
normal haemoglobin sickle cell haemoglobin
thr-pro-glu-glu thr-pro-val-glu
Possible mRNA codons for these amino acids are shown below.
glutamine (glu) GAA GAG proline (pro) CCU CCC
threonine (thr) ACU ACC valine (val) GUA GUG
Which tRNA molecule is not involved in the formation of this part of the sickle…