Microorganisms and Disease
The "A" subunit of diphtheria toxin

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

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Microorganisms and Disease
The influenza vaccine is administered each year because

the vaccine is sufficiently toxic to make it necessary to administer only a small amount at any one time
None of these
it is a polysaccharide vaccine that does not confer long-term protection
mutations in the viral hemagglutinin may allow the virus to evade the immune response elicited by previous vaccines

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Microorganisms and Disease
Prontosil is

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

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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 adenylate cyclase that stops production of cAMP
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

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