This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'Which of the following mechanism is associated with a covalent modification \nSelect and explain. \nA. Reversible phosphorylation, B. Acetylation, C. ADP-ribosylation, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Acetylation, ADP-ribosylation, methylation, and phosphorylation are all examples of "reversible" covalent modifications.This is very impoant pa of enzymatic regulation (EX: Phosphorylation-Dephosphorylation reactions) Harper 30th edition pg: 92', 'role': 'assistant'}]