Pertussis toxin, also known as whooping cough toxin, inhibits the alpha subunit of Gi from being activated. What might be a cellular mechanism of this toxin's action?
A) It enhances the dissociation of G alpha and G beta/gamma subunits.
B) It irreversibly activates G alpha subunit in GTP bound state.
C) It prevents association between the G alpha subunit and the receptor.
D) It stimulates the binding of G alpha subunit to adenylyl cyclase.
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