Which of the following is the correct order of steps in the EGF–cAMP signaling pathway?
A) ligand binding–G-protein activation– adenylyl cyclase activation–cAMP production–protein kinase A activation
B) ligand binding–protein kinase A activation–G-protein activation–adenylyl cyclase activation–cAMP production
C) G-protein activation–ligand binding–adenylyl cyclase activation–cAMP production–protein kinase A activation.
D) ligand binding–G-protein activation–adenylyl cyclase activation–cAMP production–protein kinase A activation
E) ligand binding–adenylyl cyclase activation–G-protein activation–cAMP production–protein kinase A activation
Answer: D
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