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#1
10-04-2015
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Repeated USMLE Questions 124
A 23 year old man presents to the emergency room complaining of massive watery diarrhea for 6 hours. He doesn't have any vomiting or abdominal pain. Stool culture reveals a curved, gram positive rod which secretes an enterotoxin contains A subunit and a binding B subunit.
What is the most likely reason for this patient's massive diarrhea? A- Deficiency in the brush border enzymes B- Inhibition of the conversion of Gi-GDP to Gs-GTP C- Inhibition of the conversion of Gs-GTP to Gs-GDP D- Destruction of the absorptive epithelium E- Increased motility of the small intestine Answer 
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#2
10-04-2015
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C _ vibrio cholerae
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