The cholera and E. coli (traveler's diarrhea) toxins __________, leading to high levels of cAMP in the cell.
a. ADP ribosylate the Gs factor
b. ADP ribosylate adenyl cyclase
c. inactivate ATP
d. are bacterial adenylate cyclase
e. phosphorylates the G factor
Answer: ADP ribosylate the Gs factor
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