As Regards Receptors Coupled to Gs (G-Stimulatory) and CAMP, Which

question 63

Multiple Choice

As regards receptors coupled to Gs (G-stimulatory) and cAMP, which of the following is false?

• A) Binding of ligand to its receptor activates another distinct protein which catalyzes the displacement of GDP with GTP on the alpha Gs subunit.
• B) The GTP?Gs alpha subunit dissociates from the beta/gamma subunits and activates adenylate cyclase.
• C) Adenylate cyclase catalyzes the conversion of ATP to cAMP.
• D) cAMP activates cAMP dependent protein kinase by binding to the regulatory subunits which causes dissociation of the regulatory subunits from the catalytic subunits.
• E) The catalytic subunit of cAMP dependent protein kinase can phosphorylate proteins on serine.

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