An External Stimulus Causes a Specific Intracellular Response

Multiple Choice

An external stimulus causes a specific intracellular response. Which is the most likely order in which signal transducers would work?

A) G protein; cAMP; protein kinase
B) protein kinase; cAMP; G protein
C) cAMP; protein kinase; G protein
D) protein kinase; G protein; cAMP
E) cAMP; G protein; protein kinase