micro chap 5 quiz all attempts
Which of the following will not support viral cultivation?
Live lab animals Embryonated bird eggs Primary cell cultures Continuous cell cultures
t/f Viral spikes are inserted into the host cell membrane before budding or exocytosis.
TRUE: Viral spikes are inserted into the host cell membrane before budding or exocytosis.
What structures are used by bacteriophages to attach to host cell receptors?
Tail fibers
What type of phage enters an inactive prophage stage?
Temperate
What is the rationale for providing intravenous fluids and oxygen support for this patient?
These measures are supportive therapies while the disease runs its course
Which of the following is a type of cytopathic effect? Show answer choices Inclusions in the nucleus Multinucleated giant cells Inclusions in the cytoplasm Cells change shape All of the choices are correct
all the choices are correct
Viruses that infect bacteria are specifically called _____.
bacteriophages
A(n) _______ is the protein shell around the nucleic acid core of a virus.
capsid
Virus capsids are made from subunits called _____.
capsomeres
A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures. Show answer choices embryo cell plaque bacteriophage egg
cell
Viral genetic studies, vaccine development and clinical identification would not be possible without the ability to________.
culture virusesin vivo andin vitro
Which of the following is not a characteristic of a transformed cell? Show answer choices Viral nucleic acid integrated into host DNA Decreased growth rate Alterations in chromosomes Changes in cell surface molecules Capacity to divide indefinitely
decreased growth rate
Satellite viruses are ________.
dependent on other viruses for replication
A specific animal virus has the ability to attach to and enter almost any animal host cell. T True F
false
Glycoprotein spikes are essential for mediating the release stage of the viral life cycle. t/f
false
T/F Glycoprotein spikes are essential for mediating the release stage of the viral life cycle.
false
The adeno-associated virus (AAV) is a prion. t/f
false
Viruses are ultramicroscopic because they range in size from 2 mm to 450 mm T/F
false
Viruses attach to their hosts via ________.
host glycoproteins
The activation of a prophage is called _____.
induction
T-even phages ________.
infect Escherichia coli cells
Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called _____. Show answer choices latent oncogenic prions viroids delta agents
latent
Viruses have all the following except ________. definite shape metabolism genes the ability to infect host cells ultramicroscopic size
metabolism
Cells grown in culture form a(n) _____.
monolayer
Mammalian viruses capable of starting tumors are _____.
oncoviruses
Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called _____.
plaques
Infectious protein particles are called _____
prions
Infectious protein particles are called _____.
prions
Two noncellular agents, smaller than viruses, are the infectious proteins called _______ and the infectious RNA strands called ________.
prions; viroids
Viral spikes ________.
protrude from the envelope
Viruses acquire envelopes around their nucleocapsids during _____.
release
T/F When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the host cell.
true
Viruses are unable to multiply outside of a host cell. T/F
true
t/f Prophages can be activated into viral replication and enter the lytic cycle.
true
t/f Viruses are simple, noncellular, and lack ribosomes.
true
Host range is limited by________.
type of host cell receptors on cell membrane
The process of dissolving the envelope and capsid to release the viral nucleic acid is _____.
uncoating
Lysogeny refers to ________.
viral genome inserting into bacterial host chromosome
Infectious naked strands of RNA that affect plants are called _____
viroids
The development of antiviral drug therapy is difficult because ________.
viruses are obligate intracellular parasites so the host cell can be harmed by the drug
Creutzfeldt-Jacob disease is ________.
a spongiform encephalopathy of humans