Which of the following statements about ubiquitin-proteasome pathway is true?

A It is involved in the synthesis of new proteins
B It degrades proteins that are damaged or no longer needed by tagging them with ubiquitin molecules ✓
C It is responsible for protein folding
D It regulates gene expression

Explanation

The ubiquitin-proteasome pathway is a key mechanism for protein degradation, where proteins are tagged with ubiquitin molecules and then degraded by proteasomes, helping to remove damaged or unnecessary proteins from the cell.

Source

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