11. (4 pts) Initiation of the translation process requires energy. Select a choi

Question

11. (4 pts) Initiation of the translation process requires energy. Select a choice below that describes a step in this process that requires GTP hydrolysis. O GTP hydrolysis occurs after met tRNA met has been properly inserted into the A site O GTP hydrolysis is required for translocation O GTP hydrolysis is required to prevent the large and small subunits from joining together prematurely O GTP is hydrolyzed after the initiator met tRNAmet has been properly inserted into the P site and there is a match between the anti-codon and the AUG codon

Explanation / Answer

There following 3 steps requires GTP hydrolysis:

Step 1: Position incoming aa-tRNAmet

Step 2: Peptidyl Transferase

•Thermodynamically favorable breaking of high energy ester

•Growing peptide ends up on tRNA in the A-site

Step 3: Translocation

Hence GTP hydrolysis occurs after met tRNAmet has been properly inserted into the A site is correct choice

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