1
Microbiology Lab 7 Questions with Correct
Answers | Updated (100% Correct Answers)
Endotoxins are also known as Answer: Lipid A.
When would endotoxins be released from a bacterial cell? Answer:
When the cell dies
Which of the following would be the first sign of an infection that
resulted in the release of endotoxin? Answer: Fever
Why is a release of endotoxin into the bloodstream potentially
deadly? Answer: It can lower blood pressure and cause the patient
to go into shock.
Which of the following features of Salmonella prevent it from being
phagocytosed? Answer: Flagella
Where do Salmonella pathogens grow and replicate in the infected
host? Answer: Inside phagocytes
Where is the site of Shigella attachment in the host? Answer: M
cells
How do Shigella cells move between host cells? Answer: They can
polymerize actin molecules from the epithelial cells into tail-like
structures that propel them from one cell to another.
© 2025 All rights reserved
, 2
What is the etiologic agent of typhoid? Answer: Salmonella
An exotoxin that has the ability to kill or damage host cells is
referred to as a(n) Answer: cytotoxin.
Which domain of the A-B toxin binds to cell surface receptors on
the host cell? Answer: B domain
How are superantigens different from other types of exotoxins?
Answer: Superantigens cause an overstimulation of the host
immune system.
A person who attended a picnic early in the day develops a very
high fever and is unresponsive by the evening. This person most
likely has been exposed to a(n) Answer: superantigen.
A patient who has been hospitalized with uncontrolled muscle
spasms has probably been infected with bacteria that secrete a(n)
Answer: neurotoxin.
How is Streptococcus pneumoniae able to avoid destruction by a
phagocyte? Answer: Their capsules make them "slippery" to
phagocytes.
Which microorganism requires the low pH inside a phagolysosome
in order to reproduce? Answer: Coxiella burnetii
© 2025 All rights reserved
Microbiology Lab 7 Questions with Correct
Answers | Updated (100% Correct Answers)
Endotoxins are also known as Answer: Lipid A.
When would endotoxins be released from a bacterial cell? Answer:
When the cell dies
Which of the following would be the first sign of an infection that
resulted in the release of endotoxin? Answer: Fever
Why is a release of endotoxin into the bloodstream potentially
deadly? Answer: It can lower blood pressure and cause the patient
to go into shock.
Which of the following features of Salmonella prevent it from being
phagocytosed? Answer: Flagella
Where do Salmonella pathogens grow and replicate in the infected
host? Answer: Inside phagocytes
Where is the site of Shigella attachment in the host? Answer: M
cells
How do Shigella cells move between host cells? Answer: They can
polymerize actin molecules from the epithelial cells into tail-like
structures that propel them from one cell to another.
© 2025 All rights reserved
, 2
What is the etiologic agent of typhoid? Answer: Salmonella
An exotoxin that has the ability to kill or damage host cells is
referred to as a(n) Answer: cytotoxin.
Which domain of the A-B toxin binds to cell surface receptors on
the host cell? Answer: B domain
How are superantigens different from other types of exotoxins?
Answer: Superantigens cause an overstimulation of the host
immune system.
A person who attended a picnic early in the day develops a very
high fever and is unresponsive by the evening. This person most
likely has been exposed to a(n) Answer: superantigen.
A patient who has been hospitalized with uncontrolled muscle
spasms has probably been infected with bacteria that secrete a(n)
Answer: neurotoxin.
How is Streptococcus pneumoniae able to avoid destruction by a
phagocyte? Answer: Their capsules make them "slippery" to
phagocytes.
Which microorganism requires the low pH inside a phagolysosome
in order to reproduce? Answer: Coxiella burnetii
© 2025 All rights reserved
