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BIOD 171 Module 6 Exam
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BIOD 171 Module 6 Exam
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BIOD 171 Module 6 ExamTrue or False. Because the genome is contained within an enclosed space (much
like the nucleus of a cell), viruses are classified as eukaryotic. - ANSWER False
True or False. Although viruses may contain their genome within an enclosed space
(much like the nucleus of a cell), it is considered neither eukaryotic nor prokaryotic. -
ANSWER True
Describe the two basic components of a virus. - ANSWER A virus has genomic
material made up of either DNA or RNA and a capsid which is a protective structure
that contains genetic material
True or False. You would expect to see a viral envelope on a virus infecting a
bacterial cell. - ANSWER False
The overwhelming majority of animal viruses are enveloped whereas the majority of
plant or bacteria-infecting viruses are not.
The envelope surrounds the _________ of some viruses. - ANSWER Capsid
The ________ surrounds the capsid of some viruses. - ANSWER envelope
Rank the following viruses based on their size from largest to smallest:
Paramyxovirus
Poliovirus
Smallpox virus - ANSWER Smallpox, Paramyxovirus, Poliovirus
Rank the following viruses based on their size from largest to smallest:
Orthomyxovirus
Poliovirus
Variolavirus - ANSWER Variolavirus
Orthomyxovirus
Poliovirus
True or False: Highly infectious viruses undergo genome replication prior to viral
attachment and entry. - ANSWER False
Place the following viral life cycle steps in order beginning with viral attachment and
provide a description of each step.
Uncoating:
Release:
Replication:
Attachment:
Entry:
New infection: - ANSWER 3- Uncoating: the viral capsid disassembles
, 5-Release: New virus particles are produced and leave the cell
4-Replication: the viral genome is the 'blueprint' to make copies of itself
1-Attachment: viral receptors bind to host proteins on the surface of the cell
2-Entry: the virus fuses with the host membrane and enters the cell
6-New infection: newly produced viruses that left the host cell now go on to infect
new cells.
True or False: Viral replication occurs after it attaches and enters the host cell. -
ANSWER True
A virus that infects bacteria is called a [answer1] and contains a [answer2] -sided
polygon capsid. - ANSWER 1. Bacteriophage
2. 20
True or False. Structurally, bacteriophages are similar to viruses that infect animals. -
ANSWER False
Identify the following components of a bacteriophage.
1- [answer1]
2- [answer2]
3- [answer3]
4- [answer4]
5- [answer5] - ANSWER 1. capsid
2. collar
3. tail
4. base plate
5. tail fibers
Describe the main differences between lytic and temperate phages. - ANSWER -
Lytic bacteriophages replicate within the host bacteria until it ruptures.
- Temporate phages primarily exist in a non-replicating state that does not kill the
host cell.
Based on the following image, would you expect the viral titer to be high or low?
Why? - ANSWER Low, since the amount of intact bacterial cells in the media
determines its turbidity,
the amount of virus present in the tube has to be minimal. The amount of virus in the
image is low. As the lytic cycle continues, more bacteria cells will be destroyed and
the media will be cleared.
Which of the following can be spread via airborne particles:
Measles
Mumps
Rubella
A and B
All the above - ANSWER All the above
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