<prompt> Poly A tail attached at 3 end of mRNA helps in?Unwinding of mRNAStabilization of mRNAPolymerization of mRNATranscription of mRNA  <response>: Ans. is b i.e., Stabilization of mRNA 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. 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. 