What this page covers
Practice Step 1-style biochemistry questions on G proteins: Gs / Gi / Gq + cholera / pertussis toxins, including Profuse rice-water diarrhea in a setting of poor sanitation suggests cholera, cholera toxin ADP-ribosylates Gs, while pertussis toxin ADP-ribosylates Gi, with emphasis on enzyme / mechanism and answer-choice reasoning.
How to use this page
Review the topic and reasoning focus, then practice Step 1-style questions inside BiochemStep. The question set emphasizes mechanism-first answer-choice reasoning rather than passive content review.