Which of the following is (are) an advantage(s) of protein phosphorylation in regards to biochemical signaling?
I. Phosphorylation is rapid and specific.
II. Phosphorylation is enzymatically reversible.
III. Phosphorylation can be amplified by cascade systems.
IV. Phosphorylation results in covalent modification of enzymes.
A) I, II, III, IV
B) II, III, IV
C) II, III
D) I, II
E) III only
Answer: A) I, II, III, IV
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