Which of the following types of protein modifications involves the attachment of a ubiquitin molecule to a lysine residue on the target protein?

A Phosphorylation
B Ubiquitination ✓
C Acetylation
D Glycosylation

Explanation

Ubiquitination is a type of post-translational modification that involves the attachment of a ubiquitin molecule to a lysine residue on the target protein, marking it for degradation by the proteasome.

Source

Alberts Molecular Biology of the Cell
Protein Metabolism Molecular Biology Post-Translational Modifications Hard MEDICAL Confidence: high