Question

In prokaryotes, the initial amino acid in a polypeptide chain is the modified form of methionine, N-formylmethionine, or fMet. Which term describes the codon for fMet?

A) AUG
B) UAA
C) UAG
D) UAC

Answer 1

In prokaryotes, the codon for N-formylmethionine (fMet) is AUG. It is inserted at the beginning of every polypeptide chain synthesized by prokaryotes.

Step-by-step explanation:

In prokaryotes, the codon for N-formylmethionine (fMet) is AUG. When the AUG codon is encountered during translation initiation, the initiator tRNA, which carries fMet, binds to it, marking the start of a new polypeptide chain. This formylated methionine is inserted at the beginning of every polypeptide chain synthesized by prokaryotes.