Questions and answers for exam Preparation

MCQs

Total Questions : 339 | Page 32 of 34 pages

Question 311. Which of the following characteristic of the Rotavirus was important for the construction of the Rotashield vaccine?

The possession of a segmented RNA genome
The ability of monkey Rotavirus strains to cause serious illness (diarrhea) in human beings
A limited number of capsule types
The ability of the Rotavirus to be transmitted faster

Discuss Question

Answer: Option A. -> The possession of a segmented RNA genome

Question 312. 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
All of these
phagocytes have trouble moving on the plastic surface

Discuss Question

Answer: Option C. -> All of these

Question 313. The nature of the poliovirus gives for oral vaccination (satin vaccine) as part of the eradication programme is

formalin-inactivated viruses
small dosage of wild-type live viruses
heat killed virus
live attenuated strains of all three immunological types

Discuss Question

Answer: Option D. -> live attenuated strains of all three immunological types

Question 314. Which of the following is true regarding anthrax?

Inhalation Anthrax requires infection with a large number of spores
Inhalation anthrax and cutaneous anthrax are caused by separate strains of Bacillus anthracis
Anthrax is highly contagious
Anthrax is caused by a virus

Discuss Question

Answer: Option A. -> Inhalation Anthrax requires infection with a large number of spores

Question 315. Pseudomembraneous colitis is

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

Discuss Question

Answer: Option D. -> All of these

Question 316. Mucus helps in protecting against pathogens by

lowering the pH
blocking access and attachment of pathogens to mucosal surfaces
facilitating the growth of normal flora
sequestering Iron

Discuss Question

Answer: Option B. -> blocking access and attachment of pathogens to mucosal surfaces

Question 317. 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
cleavage of rRNA that results in disruption of ribosome function
ADP ribosylation of adenylate cyclase that stops production of cAMP

Discuss Question

Answer: Option A. -> ADP ribosylation of a G protein that locks it into an active form that stimulates adenylate cyclase to make cAMP

Question 318. The toxins produced by bacteria

encourage bacterial reproduction
All of these
interfere with physiological processes in the body
kill viruses

Discuss Question

Answer: Option C. -> interfere with physiological processes in the body

Question 319. Both Mycobacterium tuberculosis and Streptococcus pneumoniae

have polysaccharide capsules
stay in the lung and rarely, if ever, enter the bloodstream
have cell walls that contain a high content of mycolic acids
are acquired by inhalation

Discuss Question

Answer: Option D. -> are acquired by inhalation

Question 320. 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
survive the acid pH of the stomach
activate T cells to proliferate and secrete cytokines
survive within macrophages

Discuss Question

Answer: Option D. -> survive within macrophages