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Nester's Microbiology: A Human Perspective

Denise Anderson, Sarah Salm, Deborah Allen

Chapter 13

Viruses, Viroids, and Prions - all with Video Answers

Educators

Chapter Questions

01:09

Problem 1

Capsids are composed of
a) DNA.
b) RNA.
c) protein.
d) lipids.
e) polysaccharides.

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Joanna Quigley
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01:09

Problem 2

The tail fihers nn nhages are assnciated with
a) attachment.
b) penetration.
c) transcription of phage DNA.
d) assembly of virus.
e) lysis of host.

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Joanna Quigley
Numerade Educator
01:37

Problem 3

Classification of viruses is based on all of the following except
a) type of nucleic acid.
b) shape of virus.
c) size of virus.
d) host infected. ir scid
e) strandedness of nucleic acid.

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Joanna Quigley
Numerade Educator
01:54

Problem 4

Temperate phages can do all of the following except
a) lyse their host cells.
b) change properties of their hosts
c) integrate their DNA into the host DNA.
d) bud from their host cells.
e) become prophages.

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Joanna Quigley
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01:26

Problem 5

All phages must have the ability to
1. have their nucleic acid enter the host cell.
2. kill the host cell
3. multiply in the absence of living bacteria
4. lyse the host cell.
5. have their nucleic acid replicate in the host cell
a) 1,2
b) 2,3
c) 3,4
d) 4,5
e) 1,5

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Joanna Quigley
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01:55

Problem 6

Filamentous phages
a) infect animal and bacterial cells.
b) cause their host cells to grow more quickly.
c) are extruded from the host cell.
d) undergo assembly in the cytoplasm.
e) degrade the host cells' DNA.

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Joanna Quigley
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01:26

Problem 7

Influenza vaccines must be changed yearly because the amino acid sequence of the viral proteins change gradually over time. Based on this information, which is the most logical conclusion? The influenza virus
a) is enveloped
b) is non-enveloped.
c) has a DNA genome.
d) has an RNA genome.
e) causes a persistent infection

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Joanna Quigley
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01:58

Problem 8

Acute infections of animals
1. are a result of productive infection.
2. generally lead to long-lasting immunity.
3. result from integration of viral nucleic acid into the host.
4. are usually followed by chronic infections.
5. often lead to tumor formation.
a) 1,2
b) 2,3
c) 3,4
d) 4,5
e) 1,5

Joanna Quigley
Joanna Quigley
Numerade Educator
01:14

Problem 9

Determining viral titers of both phage and animal viruses frequently involves
a) plaque formation.
b) quantal assays.
c) hemagglutination.
d) determining the $\mathrm{ID}_{50}$
e) counting of virions by microscopy.

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Joanna Quigley
Numerade Educator
01:17

Problem 10

Prions
a) contain only nucleic acid without a protein coat.
b) replicate like HIV.
c) integrate their nucleic acid into the host genome.
d) cause diseases of humans.
e) cause diseases of plants.

Joanna Quigley
Joanna Quigley
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