This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
All of the covalent modification regulate enzyme kinetics except 
Select and explain. 
A. Phosphorylation, B. Acetylation, C. ADP Ribosylation, D. Glycosylation
D: Glycosylation
Answer: D: Glycosylation 
Explanation: Reversible covalent modifications
• Phosphorylation Dephosphorylation
• ADP Ribosylation
• Methylation
• Acetylation.
Irreversible Covalent Modification
• Zymogen activation/ Partial Proteolysis.