<prompt> Poly A tail attached at 31 end of mRNA helps in-Unwinding of mRNAStabilization of mRNAPolymerization of mRNATranscription of mRNA  <response>: Ans. is b i.e., Stabilization of mRNA o At the 51-end, mRNA possesses a 7-methylguanosine triphosphate cap which helps in the recognition of mRNA in protein biosynthesis and it helps to stabilize the mRNA by preventing attack of 51-exonuclease.o At its 31-end. there is a poly-A tail made up of several adenylate residues which stabilize mRNA by preventing attack of 31-exonuclease. 