Question 1
2 / 2 pts
True or False. Although viruses may contain their genome within an enclosed space (much like the nucleus of a cell), it is
... [Show More] considered neither eukaryotic nor prokaryotic.
Correct! True False
Question 2
5 / 5 pts
Describe the two basic components of a virus. Your Answer:
Genomic material comprised of either DNA or RNA and a capsid
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.
Question 3
3 / 3 pts
The surrounds the capsid of some viruses. Your Answer:
envelope
envelope
Question 4
2 / 2 pts
True or False. You would expect to see a viral envelope on a virus infecting a bacterial cell. True
Correct! False
False. The overwhelming majority of animal viruses are enveloped whereas the majority of plant or bacteria-infecting viruses are not.
Question 5
3 / 3 pts
Rank the following viruses based on their size from largest to smallest:
Orthomyxovirus
Poliovirus
Variolavirus
Your Answer:
1. Variolavirus 2. Orthomyxovirus 3. Polivirus
Variolavirus (~200nm) > Orthomyxovirus (100-150nm) > Poliovirus (~30nm)
Question 6
2 / 2 pts
True or False: Viral replication occurs after it attaches and enters the host cell. Correct!
True
True. The viral genome is never replicated before attachment and entry. False
Question 7
5 / 5 pts
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:
Your Answer:
1. Attachment: viral receptors bind to a host proteins on te surface of the cell.
2. Entry: The virus fuses with the host membrane and enters the cell
3. Uncoating: The viral capsid dissasembles
4. Replication: The viral genome provides the blueprint to make copies of itself
5. Exit: New viruses are produced and leave a cell.
6. New infection: Newly produced viruses leave the host cell and go on to infect new cells. The process outlined above now restarts.
3- Uncoating: the viral capsid disassembles
5-Release: New virus particles are produced and leave the cell
4-Replication: the viral genome is the ‘blueprint’ to make copies of itself
1- Attachment: viral receptors bind to host proteins on the surface of the cell
2- Entry: the virus fuses with the host membrane and enters the cell
6-New infection: newly produced viruses that left the host cell now go on to infect new cells.
Question 8
3 / 3 pts
A virus that infects bacteria is called a [answer1] and contains a [answer2] -sided polygon capsid. Your Answer:
1. bacteriophages 2. 20 sided polygon capsid
1. Bacteriophage
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