In prokaryotes, the first amino acid in protein synthesis is always
A) methionine.
B) N-formyl methionine.
C) an acidic amino acid.
D) the first amino acid of the signal sequence.
E) L-methionine.

Question

Quizplus · Accepted Answer

In prokaryotes, the first amino acid incorporated during protein synthesis is N-formyl methionine (fMet), not the methionine (Met) used by eukaryotes. This modified form of methionine is used to initiate protein synthesis in prokaryotic cells.

In Prokaryotes, the First Amino Acid in Protein Synthesis Is