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30 Cards in this Set

  • Front
  • Back
List 4 characteristics of viruses.
definite shape
genes
ability to infect host cells
ultramicroscopic size
Host cells of viruses include;
humans and other animals
plants and fungi
bacteria
protozoa and fungi
Classification of viruses into families involves determining atleast 4 factors. What are they?
type of nucleic acid
type of capsid
presence of an envelope
number of strands in the nucleic acid
Virus capsids are made from subunits called...
capsomeres
helical and icosahedral are terms used to describe the shapes of a virus'...
capsid
List 4 characteristics that pertain to virus envelopes?
gained as a virus leaves the host cell membrane
gained as a virus leaves the nuclear membrane membrane
contain special virus proteins
help the virus particle attach to host cells
Viral envelopes are not associated with every virus. TRUE/FALSE
TRUE.
These structures are used by bacteriophages to attach to host cell receptors.
tail fibers
List 4 facts about prophages.
present when the virus is in lysogeny
formed when viral DNA enters the bacterial chromosome
T even phages infect E. coli cells. TRUE/FALSE
TRUE
List the 6 sequence of events in viral multiplication.
1. adsorption
2. penetration
3. replication
4. maturation
5. assembly
6. release
List an event that occurs in bacteriophage multiplication that does not occur in animal virus replication is...
Injection of the viral nucleic acid into the host cell
Viruses acquire envelopes around their nucleocapsids during...
release
List 4 media that will support viral cultivation.
1. live lab animals
2. embryonated bird eggs
3. primary cell cultures
4. continuous cell cultures
In general, most DNA viruses multiply in the hosts cells nucleus, while most RNA viruses multiply in the hosts cells cytoplasm. TRUE/FALSE
TRUE
Host range is limited by...
type of host cell receptors on cell membrane
The virus induced, specific damage to the host cell that can be seen in a light microscope is called...
cytopathic effects
Visible clear, well defined patches in a monolayer of virus infected cells in a culture are called...
plaques
Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called...
pocks
Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called...
latent
Oncogenic viruses include...
1. hepatitis B virus
2. papilloma virus
3. HTLV1 and HTLV11 viruses
4. Epstein Barr virus
List 4 characteristics of viral induced cytopathic effects.
1. inclusions in the nucleus
2. multinucleated giant cells
3. inclusions in cytoplasm
4. cells round up
Uncoating of viral nucleic acid...
1. does not occur in bacteriophage multiplication
2. involves enzymatic destruction of the capsid
3. occurs during penetration in the multiplication cycle
4. occurs before replication
Infectious protein particles are called...
prions
Infectious naked strands of RNA are called...
viroids
Creutafeldt-Jacob disease is...
a spongiform encephalopathy of humans
Satellite viruses are... dependent on other viruses for replication. TRUE/FALSE
TRUE
Reverse transcriptase synthesizes...
viral DNA from RNA
Viruses attach to their hosts via...
host glcoproteins
Viral spikes bind viral capsid and envelope together. TRUE/FALSE
TRUE