Biology Forums - Study Force

Although the genetic code is universal, a few organisms such as Paramecium have a slightly modified version in which UGA, a stop codon for most organisms, codes for tryptophan in Paramecium. Suppose that the researcher wanted to make an in vitro translation system using all of the components from Paramecium.
Which of the components, if any, would she need to replace in order to have an in vitro system that was universal?


Choices:
She would need to leave out the ubiquitin
She would need to leave out the termination factor proteins.
She would need to leave out the tRNA that recognizes UGA.
She would need to leave out the P site.

I believe "She would need to leave out the termination factor proteins." is correct because we still need tRNA that recognizes UGA and the "She would need to leave out the P site." wouldn't help.