Among Enzymes, Kinases Catalyze Phosphorylation, While Phosphatases Catalyze Removal of Phosphate(s)

Multiple Choice

Among enzymes, kinases catalyze phosphorylation, while phosphatases catalyze removal of phosphate(s) . A cell's use of these enzymes can therefore function as an on-off switch for various processes. Which of the following is probably involved?

A) the change in a protein's charge leading to a conformational change
B) the change in a protein's charge leading to cleavage
C) a change in the optimal pH at which a reaction will occur
D) a change in the optimal temperature at which a reaction will occur
E) the excision of one or more peptides