Substance C is secreted from a neuron, and binds to its receptor on a nearby cell, triggering an increase in intracellular

cAMP. Substance C is therefore a ligand for a ____.



a. a receptor tyrosine kinase
b. a G-protein-coupled receptor
c. a hormone receptor
d. a ligand-gated ion channel
e. guanylyl cyclase


ANSWER: b

Biology & Microbiology

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