In olfactory receptor cells, signal transduction cascades often follow this order:
A) Receptor binding ? G-protein activation ? cAMP ? cell depolarization
B) Cell depolarization ? increased intracellular Ca2+? adenylatecyclase activation
C) Receptor binding ? opening ion channels ? G-protein activation ? cell depolatization
D) Cell depolarization ? adenylatecyclase ? G-protein activation ? conformational change
Answer: A
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