Which of the following is most likely to have a small protein called ubiquitin attached to it?

Which of the following is most likely to have a small protein called ubiquitin attached to it? 





A) a cyclin that usually acts in G1, now that the cell is in G2
B) a cell surface protein that requires transport from the ER
C) an mRNA that is leaving the nucleus to be translated
D) a regulatory protein that requires sugar residues to be attached
E) an mRNA produced by an egg cell that will be retained until after fertilization





Answer: A


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