The piece of RNA below includes the region that codes for the binding site for the initiator tRNA needed in translation
5?-GUUUCCCGUAUACAUGCGUGCCGGGGGC-3?
Which amino acid will be on the tRNA that is the first to bind to the A site of the ribosome?
(a) methionine
(b) arginine
(c) cysteine
(d) valine
Choice (b) is correct. The initiator methionine is underlined on the RNA molecule below.
5?-GUUUCCCGUAUACAUGCGUGCCGGGGGC-3?
The first tRNA to bind at the A site is the second codon of the protein, because the initiator tRNA is already bound to the P site when translation begins. The codon that follows the binding site for the initiator tRNA is CGU, which codes for arginine.
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