Question

1. Your family and friends ask you, “Is E. coli a pathogen?” What would you answer? which of the following sentences is not correct
a. Some E. coli grow normally in the human intestine, producing vitamins, such as vitamin K
b. E. coli, like other microbes can live symbiotically in our gut
c. Other strains, such as E. coli O157:H7, cause serious illness.
d. Location, location, location. If it stays where it should be no strain of E. coli is a threat
e. E. coli is a common microorganism there is nothing to be worried about

2. A new microbe has been identified as a cause of a new epidemic. Which of the following determine the biosafety measures to deal with the microbe?

a. Pathogenicity
b. Morbidity
c. Mode of transmission and host range
d. Presence of cell membrane
e. Availability of effective treatment

3. Which of the following diseases will have the most dissimilar prevention strategies:

a. Measles
b. ameabic encephalitis by Naegleria fowleri
c. Tuberculosis
d. Diphtheria
e. Ebola

4. Which of the following bioweapons would be used with the intent of terrorizing people rather than inflicting death on large numbers of individuals?
a. a virus that is easily transmitted between people and to which most individuals in a population are susceptible
b. a virus with a low infectious dose and high mortality that is easily dispersed through the air
c. a virus that is not easily transmitted between people and has a high infectious dose
d. a virus that is easily dispersed from one infected person to many within a day and has a high mortality rate

5. Psittacosis is a zoonotic disease contracted by humans during contact with bacteria found in bird droppings. Human-to-human transmission is rare. Reducing contact with bird droppings will break the chain of infection by
a. reducing the virulence of the bacteria responsible for causing the disease.
b. affecting the bacteria’s portal of entry into the human body.
c. reducing the number of organisms acting as reservoirs for the bacteria.
d. reducing the transmission of bacteria from the reservoir to humans.

6. Which of the following is an example of an obligate intracellular pathogen?

a. Listeria monocytogenes

b. Shigella dysenteriae

c. Coxiella burnetii

d. Shigella dysenteriae

d. Streptococcus pneumoniae

7. Psittacosis is a zoonotic disease contracted by humans during contact with bacteria found in bird droppings. Human-to-human transmission is rare. Reducing contact with bird droppings will break the chain of infection by
a. reducing the virulence of the bacteria responsible for causing the disease.
b. affecting the bacteria’s portal of entry into the human body.
c. reducing the number of organisms acting as reservoirs for the bacteria.
d. reducing the transmission of bacteria from the reservoir to humans.

8. Why do the residents of our normal microbiota not regularly invade other tissues of the body?
a. They are inhibited by pathogens.
b. They have not evolved the ability.
c. They are not able to survive in other tissues.
d. Our normal microbiota does regularly invade other tissues of the body.

9. In addition to digested food, where do carbohydrates come from in the large intestine?

a. mucus secretions

b. dead cells

c. saccharolytic fungi

d. arteries

10.  particular virus has a high infectious dose 50% and extremely low mortality, causing only mild symptoms. This virus has __________ infectivity and __________ virulence.
a. high; high
b. low; low
c. high; low
d. low; high

Answer 1

1) E c.oli with other organism can live symbiotically in our gut.  

2) mode of transmission and host range .

3) ebola

4) a virus that is easily transmitted between people and to which most individual in a population are susceptible.

5) reducing the virulence of bacteria responsible for causing the disease .

6) shigella dysentriae

7) reducing the virulence of bacteria responsible for causing the disease.  

8) they are not able to survive in other tissues.

9) dead cells

10) high ; low

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