True or False. Because the genome is contained within an enclosed space (much like the nucleus
of a cell), viruses are classified as eukaryotic. Ans- False. Viruses are neither eukaryotic nor
prokaryotic
Describe th
...
True or False. Because the genome is contained within an enclosed space (much like the nucleus
of a cell), viruses are classified as eukaryotic. Ans- False. Viruses are neither eukaryotic nor
prokaryotic
Describe the two basic components of a virus. Ans- 1) Genomic material made up of DNA or
RNA
2) Capsid, which is a membrane like protective structure that contains genetic material.
The ________ surrounds the capsid of some viruses. Ans- envelope
Rank the falling viruses from smallest to largest:
Poliovirus
Variolavirus
Orthomyxovirus Ans- Variolavirus
Orthomyxovirus
Poliovirus
True or False: Viral replication occurs after it attaches and enters the host cell. Ans- True
True or False. You would expect to see a viral envelope on a virus infecting a bacterial cell. AnsFalse. The majority of animal viruses are enveloped whereas the majority of plant or bacteria
infecting viruses are not
Rank the following viruses based on their size from largest to smallest:
Paramyxovirus
Polivirus
Smallpox virus Ans- 1 (Largest): Smallpox
2: Paramyxovirus
3 (Smallest): Poliovirus
True or False: Highly infectious viruses undergo genome replication prior to viral attachment
and entry. Ans- False. The viral genome is never replicated before attachment and entry
regardless 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.
Uncoating:
Release:
Replication:
Attachment:
Entry:
New infection: Ans- 1) Viral Attachment: Virus particle attaches to surface of host's cell
2) Entry: Virus fuses with host membrane and enters cell
3) Uncoating: once viral genetic material is inside host's cell, envelope will shed releasing
genetic material (disessembles)
4) Replication: Viral genetic material replicates and new viral proteins are made
5) Release: New viruses produced & leave host cell
6) New Infection: Newly released virus particles find a new host cell to infect (continuing
process)
A virus that infects bacteria is called a [answer1] and contains a [answer2] -sided polygon
capsid. Ans- Bacteriophages
20
True or False. Structurally, bacteriophages are distinct from viruses that infect plant or animal
cells. Ans- True. Bacteriophages are structurally distinct from viruses that infect plant and
animal cells
True or False: Structurally, bacteriophages are similar to viruses that infect animals Ans- False
Identify the following components of a bacteriophage. Ans- 1) Capsid
2) Collar
3) Sheath
4) Base plat
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