The Energy Source Utilized by the Elongation Factors EF-G and EF-Tu

Question

The energy source utilized by the elongation factors EF-G and EF-Tu is
A) proton motive force.
B) ATP hydrolysis.
C) GTP hydrolysis.
D) phosphoenolpyruvate hydrolysis.
E) No energy source is required.

Accepted Answer

Elongation factors EF-G and EF-Tu utilize GTP hydrolysis as the energy source for their activity during protein synthesis. EF-Tu uses GTP to deliver aminoacyl-tRNA to the ribosome during the elongation phase, and EF-G is involved in the translocation of the ribosome along the mRNA during protein synthesis. ATP hydrolysis is used for other cellular processes, such as muscle contraction and active transport. Proton motive force and phosphoenolpyruvate hydrolysis are used for ATP synthesis and not directly involved in protein synthesis. No energy source is not a valid choice as energy is required for protein synthesis.