Which of the following is common in the disease caused by Coryne-bacterium diphtheriae and Bacillus anthracis? Diphtheria toxin and edema toxin are ADP ribosylating toxins Both organisms are gram-positive spore formers Both organisms cause skin and respiratory tract infections The most serious disease symptoms are the direct result of toxin action TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following disease is not caused by microbial protein toxin? Shigella dysentery Botulism Tuberculosis Diphtheria TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following disease is caused by DNA viruses? Small pox Poliomyelitis Yellow fever Measles TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following characteristic of the Rotavirus was important for the construction of the Rotashield vaccine? A limited number of capsule types The ability of monkey Rotavirus strains to cause serious illness (diarrhea) in human beings The possession of a segmented RNA genome The ability of the Rotavirus to be transmitted faster TRUE ANSWER : ? YOUR ANSWER : ?
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 ADP ribosylation of guanylate cyclase that stimulates production of cGMP ADP ribosylation of adenylate cyclase that stops production of cAMP cleavage of rRNA that results in disruption of ribosome function TRUE ANSWER : ? YOUR ANSWER : ?
The influenza vaccine is administered each year because 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 the vaccine is sufficiently toxic to make it necessary to administer only a small amount at any one time TRUE ANSWER : ? YOUR ANSWER : ?
Immunization with which of the following toxoid induces high titer serum antibody, but does not protect from the corresponding disease? Diphtheria Botulism Shigellosis Tetanus TRUE ANSWER : ? YOUR ANSWER : ?
Type III secretion systems are used to inject "effector" proteins directly into a host cell. Salmonella uses a type III secretion system to help the pathogen to secrete LT (heat labile toxin) and ST (heat stable toxin) into the lumen of the intestine activate T cells to proliferate and secrete cytokines survive the acid pH of the stomach survive within macrophages TRUE ANSWER : ? YOUR ANSWER : ?
The toxins produced by bacteria kill viruses interfere with physiological processes in the body All of these encourage bacterial reproduction TRUE ANSWER : ? YOUR ANSWER : ?
Plastic implants can pose a serious nosocomial infection problem because infected implants usually have to be surgically removed phagocytes have trouble engulfing bacteria embedded in a biofilm phagocytes have trouble moving on the plastic surface All of these TRUE ANSWER : ? YOUR ANSWER : ?