3. In bacterial mRNAs, the AUG start codon is distinguished from all other AUGs by which...

3. In bacterial mRNAs, the AUG start codon is distinguished from all other AUGs by which of the following mechanisms ?

a) Ribosomal subunits bind at the 5’ end of the mRNA and scan down to the first AUG, which always serves at the initiation codon in bacteria
b) It is recognized by a specific initiation factor
c) It is preceded by a ribosome binding site sequence that base pairs with 16S rRNA
d) The 80S ribosome specifically recognizes initiation codons in bacteria
e) None of the above.

Expert Solution

Answer: C. It is preceeded by a ribosomal binding site sequence that base pairs with 16S rRNA. This sequence in the prokaryotes is termed as kozak sequence and is present in the 5' untranslated region of the start codon.

gladiator answered 2 years ago

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