Which of the Following Statements About Cell Signaling in Voles

Which of the following statements about cell signaling in voles is false?

A) A signal transduction pathway can bring about changes in behavior.
B) Oxytocin and vasopressin are signals that induce bonding and caring behaviors in voles.
C) Oxytocin acts as a signal for premating behaviors.
D) The interaction of the receptor and the signal causes the receptor to change shape.
E) Although oxytocin and vasopressin are widely circulated in the bloodstream, they only bind to a few cell types.