PORTAGE BIOD 171 MICROBIOLOGY
MODULE 6 EXAM REVIEW 100%
SOLVED
, True or False. Because the genome is contained within an enclosed space (much like
the nucleus of a cell), viruses are classified as eukaryotic - ANSWERFalse. Viruses are
neither eukaryotic nor prokaryotic.
Describe the two basic components of a virus. - ANSWER1. 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. - ANSWERcapsid
True or False. You would expect to see a viral envelope on a virus infecting a bacterial
cell. - ANSWERFalse. 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 - ANSWERVariolavirus (~200nm) > Orthomyxovirus (100-150nm) >
Poliovirus (~30nm)
True or False: Viral replication occurs after it attaches and enters the host cell. -
ANSWERTrue. 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) - ANSWER1. 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 - ANSWERviral receptors bind to the new cell surface
Uncoating - ANSWERviral capsid dissassembles
Release - ANSWERnew virus particles are produced and leave the cell
Replication - ANSWERviral genome makes copies of itself
Entry - ANSWERvirus combines with host membrane and enters the cell
MODULE 6 EXAM REVIEW 100%
SOLVED
, True or False. Because the genome is contained within an enclosed space (much like
the nucleus of a cell), viruses are classified as eukaryotic - ANSWERFalse. Viruses are
neither eukaryotic nor prokaryotic.
Describe the two basic components of a virus. - ANSWER1. 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. - ANSWERcapsid
True or False. You would expect to see a viral envelope on a virus infecting a bacterial
cell. - ANSWERFalse. 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 - ANSWERVariolavirus (~200nm) > Orthomyxovirus (100-150nm) >
Poliovirus (~30nm)
True or False: Viral replication occurs after it attaches and enters the host cell. -
ANSWERTrue. 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) - ANSWER1. 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 - ANSWERviral receptors bind to the new cell surface
Uncoating - ANSWERviral capsid dissassembles
Release - ANSWERnew virus particles are produced and leave the cell
Replication - ANSWERviral genome makes copies of itself
Entry - ANSWERvirus combines with host membrane and enters the cell
