Question

How many G proteins are involved in chain initiation, elongation, and termination respectively, in E.Coli?

A) 1, 1, 1
B) 2, 2, 2
C) 1, 2, 3
D) 3, 2, 1

Answer 1

In E. coli protein synthesis, three initiation factors are involved in initiation, two elongation factors in elongation, and one release factor in termination, making the correct answer D) 3, 2, 1.

Step-by-step explanation:

In E. coli, protein synthesis involves different stages: initiation, elongation, and termination. During initiation, the formation of an initiation complex involves three initiation factors (IFs; IF-1, IF-2, and IF-3). For elongation, two elongation factors (EFs; EF-Tu and EF-G) are involved in aiding the addition of amino acids to the growing peptide chain. Lastly, for termination, three release factors (RFs; RF-1, RF-2, and RF-3) come into play to release the finished polypeptide from the ribosome. Hence, the correct answer to the question 'How many G proteins are involved in chain initiation, elongation, and termination respectively, in E.Coli?' is D) 3, 2, 1.