Which choice describes the activation steps of a G protein-coupled receptor properly (and in correct order) ?
A) Ligand binds to receptor, G protein activated, effector protein activated, second messenger made available
B) Ligand binds to receptor, second messenger activated, G protein turned on, protein kinase activated
C) Protein kinase activated, ion channel opened, ions enter and activate second messenger, G protein turned on
D) Ion channel opened, G protein activated, second messenger synthesized, phosphatase ends signal
Correct Answer:
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