Portage Learning BIOD 171 Module 6
Exam Module 6
1. 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.
2. Describe the two basic components of a virus.
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.
3. The………………surrounds the capsid of some viruses.
Envelope.
4. 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.
5. Rank the following viruses based on their size from largest to
smallest:
Orthomyxovirus
Poliovirus
Variolavirus
Variolavirus (~200nm) > Orthomyxovirus (100-150nm) > Poliovirus (~30nm)
6. 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. The viral genome is never replicated before attachment and entry.
, 7. 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:
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.
8. A virus that infects bacteria is called a…….and contains a……..-
side polygon capsid.
Bacteriophage; 20-sided
9. True or False. Structurally, bacteriophages are similar to viruses
that infect animals.
False. Bacteriophages have a distinct composition and structure.
10. Identify the following components of a bacteriophage.
Exam Module 6
1. 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.
2. Describe the two basic components of a virus.
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.
3. The………………surrounds the capsid of some viruses.
Envelope.
4. 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.
5. Rank the following viruses based on their size from largest to
smallest:
Orthomyxovirus
Poliovirus
Variolavirus
Variolavirus (~200nm) > Orthomyxovirus (100-150nm) > Poliovirus (~30nm)
6. 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. The viral genome is never replicated before attachment and entry.
, 7. 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:
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.
8. A virus that infects bacteria is called a…….and contains a……..-
side polygon capsid.
Bacteriophage; 20-sided
9. True or False. Structurally, bacteriophages are similar to viruses
that infect animals.
False. Bacteriophages have a distinct composition and structure.
10. Identify the following components of a bacteriophage.
