Combo with Microbiology Chapter 15 and 8 others Questions And Answer
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Course
Combo with Microbiology
Institution
Combo With Microbiology
How do we identify mutants?
~ Look at the morphology, differential staining, and chemical testing
How do we identify mutagens?
~ Look at the direct effect or perform animal testing
What are the four different chemical mutagens?
~ Nitrous acid, nucleoside analogs, ionizing radiation, and ...
Combo with Microbiology
Chapter 15 and 8 others
Questions And Answers
All of the following are examples of cytopathic effects of viruses except
________.
1. cell surface antigens change
2. host cells fuse to form multinucleated syncytia
3. inclusion bodies are found in the cytoplasm or nucleus
4. None of these choices. There are no exceptions here.
✓~ 4. None of these choices. There are no exceptions here.
Which of these effects is most likely to occur if a pathogen enters the body by
a portal of entry other than the preferred one?
1. A more severe disease will result.
2. A milder disease will result.
,3. A different disease of the same severity will result.
4. Pathogens cannot enter by alternate routes.
✓~ 2. A milder disease will result
Which one of the following virulence factors contributes most to the spread of
disease in the body?
1. hyaluronidase
2. hemolysin
3. endotoxin production
4. siderophore production
✓~ Hyaluronidase
The presence of endotoxins in a sterile fluid indicates ________.
1. gram-positive bacteria are growing
2. gram-negative bacteria are growing
3. the fluid is not sterile
4. the presence of gram-negative cell walls
, ✓~ The presence of gram-negative cell walls
Viruses can evade host defenses by ________.
1. producing enzymes that destroy antibody molecules
2. "hiding" inside host cells where they cannot be detected by the host's
immune system
3. producing leukocidins that actively destroy white blood cells
4. inhibiting phagocytosis due to the presence of the viral envelope
✓~ 2. "hiding" inside host cells where they cannot be detected by the host's immune
system
Which of these organisms does not produce a neurotoxin?
1. Clostridium botulinum bacteria
2. Clostridium tetani bacterium
3. rabies virus
4. Alexandrium algae
✓~ Rabies virus
, Which of these organisms does not produce an enterotoxin?
1. Shigella spp.
2. Clostridium botulinum
3. Vibrio cholerae
4. Staphylococcus aureus
✓~ Colostridium botulinum
Given the following LD50 values for Bacillus anthracis, through which portal of
entry is it easiest to get anthrax?
1. All are equally easy portals of entry.
2. Cutaneous-50 endospores
3. Inhalation-20,000 endospores
4. Ingestion-1,000,000 endospores
✓~ Cutaneous 50 endospores
Host cells transformed by viral infection may ________.
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