In an Experiment Examining Adrenergic Receptors, Epinephrine Alone Was Not

Multiple Choice

In an experiment examining adrenergic receptors, epinephrine alone was not able to trigger an increase in cAMP, but when beta receptors were fused with animal cells, there were high levels of cAMP. This indicates ____ was occurring.

A) activation of epinephrine
B) protein kinase inhibition
C) activation of adenylyl cyclase only
D) protein kinase amplification only
E) both activation of adenylyl cyclase and protein kinase amplification