Microbiology – MCQ 41 – Mechanism of action of cholera toxin

In the small intestine, cholera toxin acts by:
A. ADP-ribosylation of the G regulatory protein
B. Inhibition of adenyl cyclase
C. Activation of GTPase
D. Active absorption of NaCl

Correct answer : A. ADP-ribosylation of the G regulatory protein

Cholera toxin increases adenyl cyclase activity by irreversible ADP ribosylation of GTP binding domain of adenyl cyclase.

Add a Comment

Your email address will not be published. Comments will be displayed only after moderation.

Read previous post:
pathology mcq
Pathology – MCQ 58 – Fibrinoid necrosis

Fibrinoid necrosis may be observed in all of the following, except: A. Malignant hypertension B. Polyarteritis nodosa C. Diabetic glomerulosclerosis...

Close