This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Binding of Eukaryotic mRNA to Ribosomes is facilitated by 
Select and explain. 
A. Capping, B. Poly-A tail, C. tRNA, D. Shine-Dalgarno sequence
A: Capping
Answer: A: Capping 
Explanation: Answer- A. Capping* In E. coli mRNA, a leader sequence upstream of the first AUG codon, called the Shine-Dalgarno sequence (also known as the ribosomal binding site AGGAGG), interacts through complementary base pairing with the rRNA molecules that compose the ribosome.* In eukaryotic initiation complex recognizes the 5' cap of the eukaryotic mRNA, then tracks along the mRNA in the 5' to 3' direction until the AUG sta codon is recognized. At this point, the 60S subunit binds to the complex of Met-tRNAi, mRNA, and the 40S subunit.