Microorganisms and Disease
Pseudomembraneous colitis is

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

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Microorganisms and Disease
Which of the following is common in the disease caused by Coryne-bacterium diphtheriae and Bacillus anthracis?

The most serious disease symptoms are the direct result of toxin action
Both organisms cause skin and respiratory tract infections
Both organisms are gram-positive spore formers
Diphtheria toxin and edema toxin are ADP ribosylating toxins

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Microorganisms and Disease
The "A" subunit of diphtheria toxin

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

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Microorganisms and Disease
Prontosil is

an effective antibacterial when used in animals
an effective antibacterial when used in in-vitro cultures
not used as an antibacterial agent
an effective antibacterial both in animals as well as in in-vitro cultures

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