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Transfer RNAs are thought to improve the fidelity of mRNA translation by

Question : Transfer RNAs are thought to improve the fidelity of mRNA translation by : 2134180

16) Transfer RNAs are thought to improve the fidelity of mRNA translation by

A. preventing translocation if an incorrect amino acid is present in the peptidyl transferase center.

B. increasing the rate of GTP hydrolysis by EF-Tu upon accurate codon-anticodon pairing.

C. activating proofreading activity of eEF2.

D. linking codon-anticodon mispairing in the P site to translation termination.

17) The stop codon is recognized by

A. a special aminoacyl tRNA

B. eRF1 and eRF2

C. GTP

D. a molecular chaperone

18) Which of the following does not need to occur for translation to terminate?

A. cleavage of the polypeptide from the tRNA in the P-site

B. recognition of the stop codon by a release factor

C. translocation by eEF2

D. binding of a tRNA to the A-site

19) Nascent polypeptides exit the ribosome via

A. the E (exit) site

B. the mRNA exit channel

C. a long tunnel

D. a large cavity that allows protein folding before its release

20) The crystal structure of the ribosome provided key new evidence that

A. the mechanism of translation is fundamentally different among the three branches of life.

B. the mRNA is situated in a tunnel in the small ribosomal subunit.

C. ribosomal proteins facilitate structural transitions during translocation.

D. ribosomal RNAs catalyze peptide bond formation.

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