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Micro Chapter 15
Test Description: Micro Chapter 15
Instructions: Answer all questions to get your test result.
1) The most frequently used portal of entry for pathogens is the
A
mucous membranes of the gastrointestinal tract.
B
skin.
C
parenteral route
D
mucous membranes of the respiratory tract.
2) 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
lysogenic conversion.
C
cytopathic effect
D
virulence.
3) Botulism is caused by ingestion of a proteinaceous exotoxin; therefore, it can easily be prevented by
A
boiling food prior to consumption.
B
filtering food.
C
administering antibiotics to patients.
D
preventing fecal contamination of food.
4) Symptoms of protozoan and helminthic diseases are due to
A
products released from damaged tissues.
B
All of these
C
waste products excreted by the parasite.
D
tissue damage due to growth of the parasite on the tissues.
5) Lysogenic bacteriophages contribute to bacterial virulence because bacteriophages
A
kills the bacteria, causing release of endotoxins.
B
produce toxins.
C
give new gene sequences to the host bacteria.
D
carry plasmids.
6) 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
skin, parenteral, and mucous membranes
D
parenteral
7) Bacteria such as E. coli and Salmonella produce invasins that bind host cells, thus causing the cells to
A
destroy the bacteria.
B
release cytokines.
C
produce iron-binding proteins.
D
engulf the bacteria.
8) Biofilms provide pathogens with an adhesion mechanism and aid in resistance to antimicrobial agents.
A
False
B
True
9) Many pathogens use the same portal for entry and exit from the body.
A
True
B
False
10) Most pathogens that gain access through the skin
A
must adhere first while their invasive factors allow them to penetrate.
B
must be injected.
C
enter through hair follicles and sweat glands.
D
can penetrate intact skin.
*select an answer for all questions
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