Portage Learning Microbiology BIOD 171 module 6 Questions and Answers
True or False: Because the genome
is contained within an enclosed space, False. Viruses are neither eukaryotic nor
(much like the nucleus of a cell) viruses prokaryotic
are classified as eukaryotic
A virus has 1. genomic material com-
prised of either DNA or RNA and 2.
Describe the two basic components of a a capsid, a membrane-like protective
virus (short answer) structure that contains the genetic mate-
rial, similar to the nucleus of a eukaryotic
cell
The surrounds the capsid of some
Envelope
viruses
The envelope surrounds the of
Capsid
some viruses
False. The overwhelming majority of ani-
True or False: You would expect to see a
mal viruses are enveloped whereas the
viral envelope on a virus infecting a plant
majority of plant or bacteria-infecting
cell
viruses are not
True or False: You would expect to see
a viral envelope on a virus infecting a False: Not all the viruses have envelopes
bacterial cell
Rank the following viruses based on their
size from largest to smallest: orthomyx- Variolavirus>Orthomyxovirus>Poliovirus
ovirus, poliovirus, variolavirus
Rank the following viruses based on their
size from largest to smallest:Paramyx- Smallpox>Paramyxovirus>Poliovirus
ovirus, Poliovirus, Smallpox virus
True or False: Viral replication occurs af- True. The viral genome is never replicat-
ter it attaches and enters the host cell ed before attachment and entry
True or False: Highly infectious viruses False. The viral genome is never replicat-
undergo genome replication prior to viral ed before attachment and entry regard-
attachment and entry. less of its level of infectivity.
Place the following viral life cycle steps
in order beginning with viral attachment
and provide a description of each step
(short answer)
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, Portage Learning Microbiology BIOD 171 module 6 Questions and Answers
Uncoating: the viral capsid disassembles
Release: New virus particles are pro-
duced and leave the cell
Replication: the viral genome is the 'blue-
print' to make copies of itself
Attachment: viral receptors bind to host
proteins on the surface of the cell
Entry: the virus fuses with the host mem-
brane and enters the cell
New Infection: newly produced viruses
that left the host cell now go on to infect
new cells
A virus that infects bacteria is called a
and contains a -side poly- Bacteriophage; 20-sided
gon capsid (fill in the blank)
True or False: Structurally bacterio-
False. Bacteriophages have a distinct
phages are similar to viruses that infect
composition and structure
animals
True or False. Structurally, bacterio- True. Bacteriophages are structurally dis-
phages are distinct from viruses that in- tinct from viruses that infect plant and
fect plant or animal cells. animals cells.
1. Capsid
2. Collar
Identify the following components of a
3. Tail
bacteriophage (picture)
4. Base
5. Tail fibers
Lytic bacteriophages replicate within the
host bacteria until it ruptures, whereas
temperate phages primarily exist in a
non-replicative state that does not kill the
Describe the main differences between
host cell
lytic and temperate phages (short an-
swer)
Lytic phages replicate all viral pro-
teins needed for the assembly of new
virus particles whereas lysogenic phage
genomes are integrated into the host
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True or False: Because the genome
is contained within an enclosed space, False. Viruses are neither eukaryotic nor
(much like the nucleus of a cell) viruses prokaryotic
are classified as eukaryotic
A virus has 1. genomic material com-
prised of either DNA or RNA and 2.
Describe the two basic components of a a capsid, a membrane-like protective
virus (short answer) structure that contains the genetic mate-
rial, similar to the nucleus of a eukaryotic
cell
The surrounds the capsid of some
Envelope
viruses
The envelope surrounds the of
Capsid
some viruses
False. The overwhelming majority of ani-
True or False: You would expect to see a
mal viruses are enveloped whereas the
viral envelope on a virus infecting a plant
majority of plant or bacteria-infecting
cell
viruses are not
True or False: You would expect to see
a viral envelope on a virus infecting a False: Not all the viruses have envelopes
bacterial cell
Rank the following viruses based on their
size from largest to smallest: orthomyx- Variolavirus>Orthomyxovirus>Poliovirus
ovirus, poliovirus, variolavirus
Rank the following viruses based on their
size from largest to smallest:Paramyx- Smallpox>Paramyxovirus>Poliovirus
ovirus, Poliovirus, Smallpox virus
True or False: Viral replication occurs af- True. The viral genome is never replicat-
ter it attaches and enters the host cell ed before attachment and entry
True or False: Highly infectious viruses False. The viral genome is never replicat-
undergo genome replication prior to viral ed before attachment and entry regard-
attachment and entry. less of its level of infectivity.
Place the following viral life cycle steps
in order beginning with viral attachment
and provide a description of each step
(short answer)
1/6
, Portage Learning Microbiology BIOD 171 module 6 Questions and Answers
Uncoating: the viral capsid disassembles
Release: New virus particles are pro-
duced and leave the cell
Replication: the viral genome is the 'blue-
print' to make copies of itself
Attachment: viral receptors bind to host
proteins on the surface of the cell
Entry: the virus fuses with the host mem-
brane and enters the cell
New Infection: newly produced viruses
that left the host cell now go on to infect
new cells
A virus that infects bacteria is called a
and contains a -side poly- Bacteriophage; 20-sided
gon capsid (fill in the blank)
True or False: Structurally bacterio-
False. Bacteriophages have a distinct
phages are similar to viruses that infect
composition and structure
animals
True or False. Structurally, bacterio- True. Bacteriophages are structurally dis-
phages are distinct from viruses that in- tinct from viruses that infect plant and
fect plant or animal cells. animals cells.
1. Capsid
2. Collar
Identify the following components of a
3. Tail
bacteriophage (picture)
4. Base
5. Tail fibers
Lytic bacteriophages replicate within the
host bacteria until it ruptures, whereas
temperate phages primarily exist in a
non-replicative state that does not kill the
Describe the main differences between
host cell
lytic and temperate phages (short an-
swer)
Lytic phages replicate all viral pro-
teins needed for the assembly of new
virus particles whereas lysogenic phage
genomes are integrated into the host
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