In the CAMP Pathway,a Signalling Molecule Binds to and Activates

Multiple Choice

In the cAMP pathway,a signalling molecule binds to and activates the cell surface receptor but the adenylyl cyclase remains inactivated.What is the most likely reason for this?

A) GDP was not replaced by GTP on the G protein.
B) Phosphodiesterase did not convert cAMP to AMP.
C) Protein kinase A was not activated.
D) The cell surface receptor did not undergo a conformational change.