Which of the following statements accurately describes the role of ubiquitin in protein degradation?

A Ubiquitin marks proteins for synthesis by ribosomes
B Ubiquitin is involved in the folding of newly synthesized proteins
C Ubiquitin tags proteins for degradation by the proteasome ✓
D Ubiquitin inhibits the activity of proteases involved in protein degradation

Explanation

Ubiquitin plays a crucial role in marking proteins for degradation by the proteasome, a large protein complex that degrades ubiquitinated proteins into smaller peptides.

Source

Cell Biology textbooks
Protein Metabolism Molecular Biology Protein Degradation Easy MEDICAL Confidence: high