Microorganisms and Disease
Lactoferrin helps to protect against pathogens by

sequestering Iron
facilitating the growth of normal flora
lowering the pH
blocking sebum production

ANSWER DOWNLOAD EXAMIANS APP

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
mutations in the viral hemagglutinin may allow the virus to evade the immune response elicited by previous vaccines
None of these
it is a polysaccharide vaccine that does not confer long-term protection

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP