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QUESTION
What is phosphorylation and why is it important?
The covalent addition of a phosphate group to a molecule.
Phosphorylation is an important mechanism by which the activity of can be altered after they are formed. A phosphate group (##PO""_4^(3-)##) is added to a protein by specific enzymes called kinases. This phosphate group is usually provided by ATP, the energy carrier of the cell.
