Question

Ubiquitin tags proteins for what purpose?

A) protect from degradation by proteasomes
B) mark for degradation by proteasomes
C) for synthesis to continue on the rough endoplasmic reticulum
D) for the protein to be secreted by exocytosis
E) for the protein to enter the nucleus and alter transcription

Answer 1

Ubiquitin tags proteins for degradation by proteasomes.

Step-by-step explanation:

The addition of an ubiquitin group to a protein marks that protein for degradation.

Ubiquitin acts like a flag indicating that the protein's lifespan is complete.

Tagged proteins are moved to a proteasome, an organelle that degrades proteins.

One way to control gene expression is to alter the longevity of the protein.