Which of the following is false about fMet-tRNAf, the initiator tRNA. a. fMet-tRNAf has a formylated amino group on a methionine residue which blocks the free NH2 group, preventing the initiator tRNA from participating in chain elongation.
b. fMet-tRNAf is only used for initiation, recognizing the codons AUG or GUG and occasionally UUG. fMet-tRNAf does not respond to internal AUG codons on an mRNA molecule.
c. the last two bases in the stem of fMet-tRNAf do not form base pairs as in all other tRNAs which prevent it from participating in elongation. Mutations that create base pairs in this region allow it to function in elongation.
d. a series of 3 G-C pairs in the stem of the loop containing the anticodon is exclusive to fMet-tRNAf. Mutations in these base pairs prevent the fMet-tRNAf from being inserted into the P site of the ribosome.
e. none of the above.