Microorganisms and Disease
Pseudomembraneous colitis is

caused by a spore-forming bacterium
precipitated by the use of certain antibiotics
caused by a gram-positive bacterium
All of these

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Microorganisms and Disease
The "A" subunit of diphtheria toxin

forms cAMP that leads to fluid accumulation
lysis macrophages with the release of cytokines
binds host cell receptors found on heart cells
cause ADP ribosylation of a factor involved in protein synthesis

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