Micro Chapter 15 Question Preview (ID: 63035)
Micro Chapter 15.
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Bacteria such as E. coli and Salmonella produce invasins that bind host cells, thus causing the cells to
a) engulf the bacteria.
b) destroy the bacteria.
c) produce iron-binding proteins.
d) release cytokines.
Polio is transmitted by ingestion of water contaminated with feces containing polio virus. What portal of entry does polio virus use?
a) skin
b) mucous membranes only
c) parenteral
d) skin, parenteral, and mucous membranes
Lysogenic bacteriophages contribute to bacterial virulence because bacteriophages
a) produce toxins.
b) kills the bacteria, causing release of endotoxins.
c) give new gene sequences to the host bacteria.
d) carry plasmids.
Symptoms of protozoan and helminthic diseases are due to
a) tissue damage due to growth of the parasite on the tissues.
b) waste products excreted by the parasite.
c) products released from damaged tissues.
d) All of these
Botulism is caused by ingestion of a proteinaceous exotoxin; therefore, it can easily be prevented by
a) filtering food.
b) preventing fecal contamination of food.
c) boiling food prior to consumption.
d) administering antibiotics to patients.
The ability of some microbes, such as Trypanosoma or Giardia to alter their surface molecules and evade destruction by the host's antibodies is called
a) antigenic variation.
b) virulence.
c) lysogenic conversion.
d) cytopathic effect
The most frequently used portal of entry for pathogens is the
a) mucous membranes of the gastrointestinal tract.
b) mucous membranes of the respiratory tract.
c) skin.
d) parenteral route
Biofilms provide pathogens with an adhesion mechanism and aid in resistance to antimicrobial agents.
a) True
b) False
c)
d)
Many pathogens use the same portal for entry and exit from the body.
a) True
b) False
c)
d)
Most pathogens that gain access through the skin
a) enter through hair follicles and sweat glands.
b) can penetrate intact skin.
c) must be injected.
d) must adhere first while their invasive factors allow them to penetrate.
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