Microorganisms and Disease
Pseudomembraneous colitis is

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

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Microorganisms and Disease
Cholera toxin is an A-B type toxin in which the B portions bind to a receptor on a host cell and the A portion enters the cell to cause

ADP ribosylation of a G protein that locks it into an active form that stimulates adenylate cyclase to make cAMP
cleavage of rRNA that results in disruption of ribosome function
ADP ribosylation of guanylate cyclase that stimulates production of cGMP
ADP ribosylation of adenylate cyclase that stops production of cAMP

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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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