PORTAGE MICROBIOLOGY EXAM #6 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS
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Module
MICROBIOLOGY
Institution
MICROBIOLOGY
PORTAGE MICROBIOLOGY EXAM #6 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS
True or False: Because the genome is contained within an enclosed space, (much like the nucleus of a cell) viruses are classified as eukaryotic
False. Viruses are neither eukaryotic nor prokaryotic
Describe the two b...
PORTAGE MICROBIOLOGY EXAM #6 QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS
True or False: Because the genome is contained within an enclosed space, (much
like the nucleus of a cell) viruses are classified as eukaryotic
False. Viruses are neither eukaryotic nor prokaryotic
Describe the two basic components of a virus (short answer)
A virus has 1. genomic material comprised of either DNA or RNA and 2. a capsid, a
membrane-like protective structure that contains the genetic material, similar to the
nucleus of a eukaryotic cell
The _____ surrounds the capsid of some viruses
Envelope
The envelope surrounds the _____ of some viruses
Capsid
True or False: You would expect to see a viral envelope on a virus infecting a
plant cell
False. The overwhelming majority of animal viruses are enveloped whereas the majority
of plant or bacteria-infecting viruses are not
True or False: You would expect to see a viral envelope on a virus infecting a
bacterial cell
False: Not all the viruses have envelopes
Rank the following viruses based on their size from largest to smallest:
orthomyxovirus, poliovirus, variolavirus
Variolavirus>Orthomyxovirus>Poliovirus
Rank the following viruses based on their size from largest to
smallest:Paramyxovirus, Poliovirus, Smallpox virus
Smallpox>Paramyxovirus>Poliovirus
True or False: Viral replication occurs after it attaches and enters the host cell
True. The viral genome is never replicated before attachment and entry
, True or False: Highly infectious viruses undergo genome replication prior to viral
attachment and entry.
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 (short answer)
Uncoating: the viral capsid disassembles
Release: New virus particles are produced and leave the cell
Replication: the viral genome is the 'blueprint' 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 membrane 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 polygon
capsid (fill in the blank)
Bacteriophage; 20-sided
True or False: Structurally bacteriophages are similar to viruses that infect
animals
False. Bacteriophages have a distinct composition and structure
True or False. Structurally, bacteriophages are distinct from viruses that infect
plant or animal cells.
True. Bacteriophages are structurally distinct from viruses that infect plant and animals
cells.
Identify the following components of a bacteriophage (picture)
1. Capsid
2. Collar
3. Tail
4. Base
5. Tail fibers
Describe the main differences between lytic and temperate phages (short answer)
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