Which of the following types of amino acid modification involves the addition of a phosphate group?

A Acetylation
B Methylation
C Phosphorylation ✓
D Ubiquitination

Explanation

Phosphorylation is a type of post-translational modification that involves the addition of a phosphate group to an amino acid residue, often serine, threonine, or tyrosine.

Mnemonic

Phosphorylation = 'phosphate' addition → adds a phosphate group

Source

Nelson et al., Lehninger Principles of Biochemistry
Protein Metabolism Biochemistry Post-Translational Modification Easy MEDICAL Confidence: high