Portage BIOD 171 Microbiology Module 6
Exam Review questions and answers
2024\2025 A+ Grade
True or False. Because the genome is contained within an enclosed space (much like the nucleus of a
cell), viruses are classified as eukaryotic
- correct answer False. Viruses are neither eukaryotic nor prokaryotic.
Describe the two basic components of a virus.
- correct answer 1. genomic material comprised of either DNA or RNA
2. a capsid: membrane-like protective structure that contains the genetic material
The envelope surrounds the _________ of some viruses.
- correct answer capsid
True or False. You would expect to see a viral envelope on a virus infecting a bacterial cell.
- correct answer False. The overwhelming 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: Orthomyxovirus
Poliovirus
Variolavirus
- correct answer Variolavirus (~200nm) > Orthomyxovirus (100-150nm) > Poliovirus (~30nm)
True or False: Viral replication occurs after it attaches and enters the host cell.
- correct answer True. The viral genome is never replicated before attachment and entry.
, Place the following viral life cycle steps in order beginning with viral attachment and provide a
description of each step.
(AEURRN)
- correct answer 1. Attachment: viral receptors bind to the new cell surface
2. Entry: virus combines with host membrane and enters the cell
3. Uncoating: viral capsid disassembles
4. Replication: viral genome makes copies of itself
5. Release: new virus particles are produced and leave the cell
6. New Infection
Attachment
- correct answer viral receptors bind to the new cell surface
Uncoating
- correct answer viral capsid dissassembles
Release
- correct answer new virus particles are produced and leave the cell
Replication
- correct answer viral genome makes copies of itself
Entry
- correct answer virus combines with host membrane and enters the cell
New infection
- correct answer newly produced viruses that left host cell go and infect new cells
A virus that infects bacteria is called a [answer1] and contains a [answer2] -sided polygon capsid.
- correct answer 1. Bacteriophage
2. 20
Exam Review questions and answers
2024\2025 A+ Grade
True or False. Because the genome is contained within an enclosed space (much like the nucleus of a
cell), viruses are classified as eukaryotic
- correct answer False. Viruses are neither eukaryotic nor prokaryotic.
Describe the two basic components of a virus.
- correct answer 1. genomic material comprised of either DNA or RNA
2. a capsid: membrane-like protective structure that contains the genetic material
The envelope surrounds the _________ of some viruses.
- correct answer capsid
True or False. You would expect to see a viral envelope on a virus infecting a bacterial cell.
- correct answer False. The overwhelming 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: Orthomyxovirus
Poliovirus
Variolavirus
- correct answer Variolavirus (~200nm) > Orthomyxovirus (100-150nm) > Poliovirus (~30nm)
True or False: Viral replication occurs after it attaches and enters the host cell.
- correct answer True. The viral genome is never replicated before attachment and entry.
, Place the following viral life cycle steps in order beginning with viral attachment and provide a
description of each step.
(AEURRN)
- correct answer 1. Attachment: viral receptors bind to the new cell surface
2. Entry: virus combines with host membrane and enters the cell
3. Uncoating: viral capsid disassembles
4. Replication: viral genome makes copies of itself
5. Release: new virus particles are produced and leave the cell
6. New Infection
Attachment
- correct answer viral receptors bind to the new cell surface
Uncoating
- correct answer viral capsid dissassembles
Release
- correct answer new virus particles are produced and leave the cell
Replication
- correct answer viral genome makes copies of itself
Entry
- correct answer virus combines with host membrane and enters the cell
New infection
- correct answer newly produced viruses that left host cell go and infect new cells
A virus that infects bacteria is called a [answer1] and contains a [answer2] -sided polygon capsid.
- correct answer 1. Bacteriophage
2. 20
