Microbiology What is the mechanism of action of cholera toxin in the small intestine? A ADP-ribosylation of the G regulatory protein B Activation of guanylate cyclase C Inhibition of adenyl cyclase D Inhibition of protein synthesis 💡 Explanation What is the mechanism of action of cholera toxin in the small intestine? ✓ Correct Answer: A. ADP-ribosylation of the G regulatory protein