Exercise: Microorganisms And Disease

Questions for: Microorganisms And Disease

The "A" subunit of diphtheria toxin
A:
binds host cell receptors found on heart cells
B:
cause ADP ribosylation of a factor involved in protein synthesis
C:
forms cAMP that leads to fluid accumulation
D:
lysis macrophages with the release of cytokines
Answer: B
No answer description is available. Let's discuss.
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The agent responsible for causing mad cow disease is thought to be a
A:
fungus
B:
protozoan
C:
prion
D:
virus
Answer: C
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Which is not a major defense mechanism in the stomach?
A:
Proteolytic enzymes
B:
Low pH
C:
Dense normal flora
D:
All of these
Answer: C
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Which of these cytokines is also known under the name cachectin?
A:
Interferon gamma
B:
Interleukin 2
C:
Tumor necrosis factor (TNF)
D:
None of the above
Answer: C
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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
A:
survive the acid pH of the stomach
B:
secrete LT (heat labile toxin) and ST (heat stable toxin) into the lumen of the intestine
C:
survive within macrophages
D:
activate T cells to proliferate and secrete cytokines
Answer: C
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