<prompt> Eukaryotic mRNA attaches to ribosome during translation due to:Poly A tailtRNA7-methylguanosine capShine dalgrino sequence  <response>: Ans. C 7-methylguanosine capRef: Harpers Illustrated Biochemistry 31st Ed; Page No- 396Eukaryotic mRNA has 7-methylguanosine cap at 5 end and poly-A tails at 3 end. The 7-methylguanosine caps help the ribosome to recognize the site of attachment to the mRNA.Once the ribosome binds the 5 end, they then scan downstream until they encounter an AUG Codon Start codonAAUAAA is present at the 3 end, is the polyadenylation sequence Poly A tail; they help stabilize the mRNA, facilitate its exit from the nucleus and aid in translation. After the mRNA enters the cytosol, the poly-A tails is gradually shortened.tRNA molecule serve as adaptors for the translation of the information in the sequence of nucleotides of the mRNA into specific amino acids.Extra EdgeDifferences between Eukaryotes and Prokaryotes in the Initiation of Protein Synthesis EukaryotesProkaryotesInitiation factorseIFs 12 or moreIFs 3Ribosomes80S 40S and 60S subunits70S 30S and 50S subunitsBinding of mRNA to small ribosomal subunitCap at 5-end of mRNA binds elFs and 40S ribosomal subunit containing methionyl tRNAiMet. mRNA is scanned for AUG start codon within the Kozak consensus sequenceShine-Dalgarno sequence upstream of initiating AUG binds to complementary sequence in 16S rRNAFirst amino acidMethionineFormyl-methionine 