45.The Ga subunit of GTP-binding proteins in G protein-coupled receptors (GPCRs) commonly has the following characteristics, except
(A)Hormone binding to its target GPCR can stimulate Gβy to release Ga into the cytoplasm.
(B) GDP binding to the Gβy components is essential for the release of Go.
(C) Certain types of Ga subunit can bind to adenylate cyclase and activate this enzyme to produce cAMP.
(D) Ga subunits typically possess relatively weak GTP hydrolysis activity.
(E) GTP hydrolysis results in dissociation of Go-adenylate cyclase complex.