Portage Microbiology BIOD 171 Exam 6
Questions and Answers | Study Guide |
Grade A+
• 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.
• The ________ surrounds the capsid of some viruses. -✓✓envelope
• 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.
• Rank the following viruses based on their size from largest to smallest:
Orthomyxovirus
Poliovirus
Variolavirus -✓✓1. Variolavirus
2. Orthomyxovirus
3. poliovirus
Variolavirus (~200nm) > Orthomyxovirus (100-150nm) > Poliovirus (~30nm)
• 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.
Uncoating:
Release:
Replication:
Attachment:
Entry:
New infection: -✓✓1. attachment- the viral receptors attach to the host cell's
proteins
2. entry- the virus takes part of the cell's membrane and enters the cell
3. uncoating- capsid is dissembled
4. replication- the viral genomic material is taken as the blueprint and replicated
5. release- the new viruses are released from the host cell
6. new infection: the new viruses infect other cells
• A virus that infects bacteria is called a [answer1] and contains a [answer2] -sided
polygon capsid. -✓✓1. Bacteriophage
2. 20
• True or False. Structurally, bacteriophages are similar to viruses that infect
animals. -✓✓False. Bacteriophages have a distinct composition and structure.
• Identify the following components of a bacteriophage. -✓✓1. capsid
2. collar
3. sheath/tail
4. base plate
Questions and Answers | Study Guide |
Grade A+
• 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.
• The ________ surrounds the capsid of some viruses. -✓✓envelope
• 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.
• Rank the following viruses based on their size from largest to smallest:
Orthomyxovirus
Poliovirus
Variolavirus -✓✓1. Variolavirus
2. Orthomyxovirus
3. poliovirus
Variolavirus (~200nm) > Orthomyxovirus (100-150nm) > Poliovirus (~30nm)
• 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.
Uncoating:
Release:
Replication:
Attachment:
Entry:
New infection: -✓✓1. attachment- the viral receptors attach to the host cell's
proteins
2. entry- the virus takes part of the cell's membrane and enters the cell
3. uncoating- capsid is dissembled
4. replication- the viral genomic material is taken as the blueprint and replicated
5. release- the new viruses are released from the host cell
6. new infection: the new viruses infect other cells
• A virus that infects bacteria is called a [answer1] and contains a [answer2] -sided
polygon capsid. -✓✓1. Bacteriophage
2. 20
• True or False. Structurally, bacteriophages are similar to viruses that infect
animals. -✓✓False. Bacteriophages have a distinct composition and structure.
• Identify the following components of a bacteriophage. -✓✓1. capsid
2. collar
3. sheath/tail
4. base plate
