Which of the Following Statements Is False

Which of the following statements is false?

A) Hormones exert their effects by interacting/binding to specific receptors which may be in the cell membrane or intracellular.
B) Phosphorylation plays an important role in many hormonal effects.
C) In humans, there exists known protein kinases that phosphorylate proteins on serine.
D) In humans, there exists known protein kinases that phosphorylate proteins on methionine.
E) In humans, there exists known protein kinases that phosphorylate proteins on tyrosine.