Final answer:
EF-G is required for elongation as it binds to the ribosome in a manner similar to the elongation factor EF-Tu.
OPTION B IS ANSWER
Step-by-step explanation:
The student is asking about the role of elongation factor EF-G in protein synthesis and its comparison to other factors involved in the process. EF-G is required for elongation during protein synthesis.
This is because EF-G binds to the ribosome in a manner similar to elongation factor EF-Tu, which is involved in the earlier stages of elongation. EF-Tu is responsible for bringing aminoacyl-tRNAs to the A site of the ribosome
while EF-G is involved in the translocation step, whereby the ribosome moves along the mRNA to the next codo n. This allows the next aminoacyl-tRNA to enter the A site. Therefore, the correct answer is b) Elongation; EF-Tu. OPTION B IS ANSWER