What is the primary function of the ubiquitin-proteasome pathway in protein metabolism?

A To synthesize new proteins
B To degrade damaged or misfolded proteins ✓
C To regulate protein folding
D To transport proteins across cell membranes

Explanation

The ubiquitin-proteasome pathway is a crucial mechanism for degrading damaged or misfolded proteins, helping to maintain protein homeostasis and prevent disease.

Mnemonic

Ubiquitin = 'ubiquitous' degradation

Source

Alberts et al., Molecular Biology of the Cell
Protein Metabolism Biochemistry Protein Degradation Medium MEDICAL Confidence: high