Which of the following statements explains how N-formylmethionine (fMet) is incorporated only in response to the 5'-AUG initiation codon in E. coli, given that methionine has only one codon?
A. There is only one tRNA with the CAU anticodon.
B. Only Met-tRNAmet can bind to a specific ribosomal entry site.
C. The N-formyl group on methionine prevents fMet from entering interior positions in a polypeptide.
D. fMet is always incorporated at interior AUG sites and then deformylated after translation.
C
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