In Olfactory Receptor Cells,signal Transduction Cascades Often Follow This Order

Question

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⁺ → adenylate cyclase activation
C)receptor binding → opening ion channels → G protein activation → cell depolatization
D)cell depolarization → adenylate cyclase → G-protein activation → conformational change

Accepted Answer

The correct sequence for signal transduction in olfactory receptor cells starts with the binding of an odorant molecule to its receptor, which activates a G-protein. This in turn activates adenylate cyclase, leading to an increase in cAMP levels. The rise in cAMP opens ion channels, allowing ions to flow into the cell and causing it to depolarize. This sequence is accurately described in option A.