Question

Which of the following is a function of the protein called ubiquitin?

a.) It attaches to proteins that are marked for destruction in the cell.
b.) It assists in the removal of introns from a eukaryotic pre-mRNA.
c.) It initiates the formation of a transcription complex.
d.) It adds the 3' and 5' caps to eukaryotic pre-mRNA.

Answer 1

The correct answer is: a) It attaches to proteins that are marked for destruction in the cell.

Ubiquitin is a regulatory protein of eukaryotic cell with the various of function. The mechanism of its action involves the addition of ubiquitin to a substrate protein (ubiquitination). Ubiquitin regulatory roles are:

• marking thee proteins for degradation via the proteasome,

• alter the cellular location of proteins,

• promoting or preventing protein interactions.