Consider the following mRNA from a eukaryotic species. Which AUG codon is translation most likely to begin from? 5'-CCUAUGAGCCACCAUGGAUGCCAAAUGCA-3'
A) 1st
B) 2nd
C) 3rd
D) 4th

Question

Quizplus · Accepted Answer

Translation usually starts at the first AUG codon encountered by the ribosome. However, sometimes there are other AUG codons that come before this "start codon," which can lead to the incorrect initiation of translation. In this mRNA sequence, the first AUG codon is preceded by a few nucleotides, making it less likely that translation will start there. The second AUG codon is closer to the 5' end of the mRNA, and is more likely to be the site of translation initiation. Therefore, choice B is the best answer.

Consider the Following MRNA from a Eukaryotic Species