Answer:
c) 30S binds Shine-dalgarno → N-formylMet-tRNA binds AUG → 50S binds → 2nd aminoacyl-tRNA binds in the A site.
Explanation:
The first step in formation of 70S initiation complex in bacterial translational initiation includes binding of 30S rRNA subunit to Shine-dalgarno sequence present on mRNA.
Soon after that N-formylMet-tRNA binds AUG (start codon) which is present on mRNA.
There are two sites in 30S rRNA which are P site and A site. The first tRNA mentioned above i.e. N-formylMet-tRNA is adjusted in P site. Then after the larger rRNA subunit which is known as 50S joins the complex.
Once the 70S initiation complex has formed, a 2nd aminoacyl-tRNA enters the complex and gets adjusted in A site located in 30S rRNA.
