BIOD 171 MICROBIOLOGY MODULE 6 EXAM
SCRIPT WITH ACCURATE ANSWERS
◉ Describe the two basic components of a virus.
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.
Answer: capsid
◉ True or False. You would expect to see a viral envelope on a virus
infecting a bacterial cell.
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
, Answer: Variolavirus (~200nm) > Orthomyxovirus (100-150nm) >
Poliovirus (~30nm)
◉ True or False: Viral replication occurs after it attaches and enters
the host cell.
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)
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
Answer: viral receptors bind to the new cell surface
◉ Uncoating
SCRIPT WITH ACCURATE ANSWERS
◉ Describe the two basic components of a virus.
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.
Answer: capsid
◉ True or False. You would expect to see a viral envelope on a virus
infecting a bacterial cell.
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
, Answer: Variolavirus (~200nm) > Orthomyxovirus (100-150nm) >
Poliovirus (~30nm)
◉ True or False: Viral replication occurs after it attaches and enters
the host cell.
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)
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
Answer: viral receptors bind to the new cell surface
◉ Uncoating
