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Microbiology, Fifth Edition
Microbiology, 5/e
Lansing M Prescott, Augustana College
Donald A Klein, Colorado State University
John P Harley, Eastern Kentucky University
Pathogenicity of Microorganisms

True or False Quiz



1

Bacterial diseases may be caused by either infections or intoxications.
A)True
B)False
2

Viruses, but not bacteria, are continuously evolving and producing unique mechanisms that enable them to escape the host's arsenal of defenses.
A)True
B)False
3

Intermittent latency is exemplified by the varicella-zoster virus which causes chickenpox in children and, in adulthood, may erupt into a disease called shingles.
A)True
B)False
4

Molecular mimicry by viral or bacterial pathogens may cause an autoimmune response.
A)True
B)False
5

Humans and other animals are dead-end hosts because virus shedding does not occur.
A)True
B)False
6

Fomites are organisms that transmit pathogens from one host to another.
A)True
B)False
7

Adhesins are specialized molecules or structures on the host cell surface that bind to complementary receptor sites on the bacterial host surface.
A)True
B)False
8

Most bacteria usually employ passive escape mechanisms.
A)True
B)False
9

Bacterial plasmids can transfer virulence factors only between the same species.
A)True
B)False
10

Pathogenicity islands are not present in nonpathogenic members of the same genus or species.
A)True
B)False
11

Bacterial infections and intoxications employ the same disease-causing process.
A)True
B)False
12

Neurotoxins are usually ingested as preformed toxins that affect the nervous system and indirectly cause enteric symptoms.
A)True
B)False
13

Hemolysins attack the plasma membranes of many cells, not just the erythrocytes.
A)True
B)False
14

Endotoxins may be removed by conventional filtration.
A)True
B)False
15

Some bacteria produce capsules that are not antigenic since they resemble host tissue components.
A)True
B)False








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