How Does the Binding of Epinephrine to Its Receptor Set

Multiple Choice

How does the binding of epinephrine to its receptor set a response in action?

A) It causes an exchange of GTP for G protein bound GDP.
B) It causes a pore to open, allowing proton/ion exchange.
C) It causes the release of insulin.
D) It causes G proteins to produce cGMP.
E) None of the answers is correct.