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Australian doctor and microbiology legend Barry Marshall proved this organism causes one condition by growing this bacterium up in culture and then drinking it himself. For 10 points each:
[10e] Name this bacterium whose ability to burrow into stomach mucus causes the formation of ulcers.
ANSWER: Helicobacter pylori [or H. pylori]
[10m] H. pylori infection can be detected via a breath test that detects whether this molecule was cleaved. H. pylori can survive in stomach acid in part because it produces an enzyme that cleaves this molecule to increase pH.
ANSWER: urea [accept urease]
[10h] H. pylori expresses this oncoprotein alongside VacA as a virulence factor that can be injected into host cells via a type IV (“four”) secretion system. This toxin’s expression is a common cause of H. pylori–associated MALT lymphomas.
ANSWER: CagA [or cytotoxin-associated gene A]
<Biology>
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Conversion

TeamOpponentPart 1Part 2Part 3TotalParts
Cornell AMinnesota1010020EM
FloridaUC Berkeley B100010E
Georgia StateWaterloo B1010020EM
HarvardGeorgia Tech0000
IndianaStanford100010E
Iowa StateToronto C100010E
Johns HopkinsMIT100010E
LSEArizona State100010E
MarylandMichigan100010E
NYUYale100010E
North Carolina AToronto A100010E
North Carolina BVanderbilt100010E
Ohio StateIllinois B100010E
Penn StateBritish Columbia100010E
RITCornell B0000
RutgersColumbia A1010020EM
Toronto BChicago B100010E
UC Berkeley ANorthwestern1010020EM
UCFColumbia B1010020EM
VirginiaWinona State100010E
Virginia TechTexas1010020EM
WUSTL AIllinois A1010020EM
WUSTL BOttawa1010020EM
Waterloo AChicago A100010E

Summary

TournamentExact Match?HeardPPBEasy %Medium %Hard %
2025 ACF NationalsYes2412.5092%33%0%