2024/2025 MICROBIOLOGY LAB EXAM
III WITH CORRECT ANSWERS
A bacteriophage initially associates with which bacterial structure?
The cytoplasmic membrane
Bacterial ribosomes
The bacterial cell wall
The bacterial chromosome - CORRECT ANSWERS- The bacterial cell wall
Three or more watery stools within a 24-hour period of time describes
infection with
listeria.
campylobacter.
salmonella.
E. coli - CORRECT ANSWERS- salmonella.
All of the employees who reported symptoms of salmonellosis had entered
the room where the spill of SE occurred.
True or False - CORRECT ANSWERS- True
,The specific serotype of Salmonella enterica causing the infection was
determined by
flow-cell cytometry.
phage typing.
plating on XLT-4 agar.
direct microscopic observation. - CORRECT ANSWERS- phage typing
Bacteriophage can infect many types of bacterial cells.
True or False - CORRECT ANSWERS- False
What biochemical reaction can be detected on Hektoen enteric agar, Kliger's
iron agar, and SIM?
Motility
Indole production
H2S production
Lactose fermentation - CORRECT ANSWERS- H2S production
The main distinction between the coliforms and noncoliforms is the ability to
utilize ________ as a nutrient.
citrate
urea
lactose
glucose - CORRECT ANSWERS- lactose
,Bacteriophage DNA directs the degradation of the bacterial host cell's DNA.
true or False - CORRECT ANSWERS- True
Once inside the host cell, viral DNA directs production of _______.
new viral particles
bacterial exotoxins
bacterial flagella
bacterial endospores - CORRECT ANSWERS- new viral particles
The final step in T2 bacteriophage infection results in
mutation of bacterial DNA.
rapid reproduction of new bacterial cells.
incorporation of viral DNA into the bacterial chromosome.
lysis of the bacterial cell and release of new viral particles. - CORRECT
ANSWERS- lysis of the bacterial cell and release of new viral particles.
What did all of the vaccine production factory workers who contracted the
illness have in common?
, They all had an egg salad sandwich for lunch.
They all used the same restroom.
They all drank out of the same water cooler.
They all worked in the room where the spill occurred. - CORRECT ANSWERS-
They all worked in the room where the spill occurred.
Why are cases of salmonellosis often underreported?
Symptoms are not severe enough to necessitate a trip to the doctor.
Patients die of the infection before they can be treated.
Treatment for salmonellosis is too expensive.
People with salmonellosis are too embarrassed to see the doctor. - CORRECT
ANSWERS- Symptoms are not severe enough to necessitate a trip to the
doctor.
The cases reported from the community were the same strain of Salmonella
enterica serotype Enteritidis as the cases in the vaccine production facility.
True or False - CORRECT ANSWERS- False
III WITH CORRECT ANSWERS
A bacteriophage initially associates with which bacterial structure?
The cytoplasmic membrane
Bacterial ribosomes
The bacterial cell wall
The bacterial chromosome - CORRECT ANSWERS- The bacterial cell wall
Three or more watery stools within a 24-hour period of time describes
infection with
listeria.
campylobacter.
salmonella.
E. coli - CORRECT ANSWERS- salmonella.
All of the employees who reported symptoms of salmonellosis had entered
the room where the spill of SE occurred.
True or False - CORRECT ANSWERS- True
,The specific serotype of Salmonella enterica causing the infection was
determined by
flow-cell cytometry.
phage typing.
plating on XLT-4 agar.
direct microscopic observation. - CORRECT ANSWERS- phage typing
Bacteriophage can infect many types of bacterial cells.
True or False - CORRECT ANSWERS- False
What biochemical reaction can be detected on Hektoen enteric agar, Kliger's
iron agar, and SIM?
Motility
Indole production
H2S production
Lactose fermentation - CORRECT ANSWERS- H2S production
The main distinction between the coliforms and noncoliforms is the ability to
utilize ________ as a nutrient.
citrate
urea
lactose
glucose - CORRECT ANSWERS- lactose
,Bacteriophage DNA directs the degradation of the bacterial host cell's DNA.
true or False - CORRECT ANSWERS- True
Once inside the host cell, viral DNA directs production of _______.
new viral particles
bacterial exotoxins
bacterial flagella
bacterial endospores - CORRECT ANSWERS- new viral particles
The final step in T2 bacteriophage infection results in
mutation of bacterial DNA.
rapid reproduction of new bacterial cells.
incorporation of viral DNA into the bacterial chromosome.
lysis of the bacterial cell and release of new viral particles. - CORRECT
ANSWERS- lysis of the bacterial cell and release of new viral particles.
What did all of the vaccine production factory workers who contracted the
illness have in common?
, They all had an egg salad sandwich for lunch.
They all used the same restroom.
They all drank out of the same water cooler.
They all worked in the room where the spill occurred. - CORRECT ANSWERS-
They all worked in the room where the spill occurred.
Why are cases of salmonellosis often underreported?
Symptoms are not severe enough to necessitate a trip to the doctor.
Patients die of the infection before they can be treated.
Treatment for salmonellosis is too expensive.
People with salmonellosis are too embarrassed to see the doctor. - CORRECT
ANSWERS- Symptoms are not severe enough to necessitate a trip to the
doctor.
The cases reported from the community were the same strain of Salmonella
enterica serotype Enteritidis as the cases in the vaccine production facility.
True or False - CORRECT ANSWERS- False
