BIO 171 MODULE 6 TEST- Portage Learning
True or False: Because the genome is contained within an enclosed space, (much like
the nucleus of a cell)
... [Show More] viruses are classified as eukaryotic - ANSFalse. Viruses are
neither eukaryotic nor prokaryotic
True or False: Although viruses may contain their genome within an enclosed space
(much like the nucleus of a cell), it is considered neither eukaryotic nor prokaryotic -
ANSTrue
Describe the two basic components of a virus (short answer) - ANSA 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 - ANSEnvelope
The envelope surrounds the _____ of some viruses - ANSCapsid
True or False: You would expect to see a viral envelope on a virus infecting a plant cell -
ANSFalse. 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 - ANSFalse: Not all the viruses have envelopes
Rank the following viruses based on their size from largest to smallest: orthomyxovirus,
poliovirus, variolavirus - ANSVariolavirus>Orthomyxovirus>Poliovirus
Rank the following viruses based on their size from largest to smallest:Paramyxovirus,
Poliovirus, Smallpox virus - ANSSmallpox>Paramyxovirus>Poliovirus
True or False: Viral replication occurs after it attaches and enters the host cell -
ANSTrue. 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. - ANSFalse. 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) - ANSUncoating: 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) - ANSBacteriopha [Show Less]