Question

Given below is a schematic representation of a mRNA strand

(i) In the above sequence identify the translational unit in mRNA. 

(ii) Where are UTRs found and what is their significance?

Answer 1

(i) Translational unit in mRNA is the sequence of RNA that is flanked by the start codon (AUG) and the stop codon (UAA) and codes for a polypeptide/ AUG AUC UCG UAA.

(ii) Untranslated regions (UTR). The UTRs are present at both 5' -end (before start codon) and at 3' -end (after stop codon). They are required for an efficient translation process.