CHAMBERLAIN MICROBIOLOGY Exam 2025
Prep Test Bank with 300 QUESTIONS WITH
CORRECT DETAILED ANSWERS &
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What is NOT true regarding viruses that infect plants?
A. They are often cultured in embryonated chicken eggs.
B. They can sometimes be cultured in insect cells.
C. They are morphologically similar to animal viruses.
D. They must enter through a wound or be introduced by an insect feeding.
E. They can spread via pollination.
A. They are often cultured in embryonated chicken eggs.
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Plant viruses are typically specific to plants so they could not be grown in
chicken eggs because they are animal cells.
A viroid is a(n) __________.
A. capsid without nucleic acid
B. provirus
C. infectious protein
D. infectious piece of RNA without a capsid
E. complete, infectious virus particle
D. infectious piece of RNA without a capsid
A viroid is a naked piece of RNA that infects plants only. If you take the 'd' in
viroid and flip it upside down it becomes a 'p' and can be associated with plants.
Which one of the following is true regarding viruses?
a) Virions contain both DNA and RNA.
b) They multiply by binary fission.
c) They are sensitive to antibiotics.
d) They are not composed of cells.
d) They are not composed of cells.
a)Virions contain either DNA or RNA.
b)They multiply by using the host cell (obligate intracellular parasites).
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c)They are not sensitive to antibiotics (these only work against bacteria).
d)They are not composed of cells - true, they are acellular
Which one of the following is NOT a morphological type of virus?
a) Helical
b) Polymorphic
c) Polyhedral
d) Enveloped
b) Polymorphic
The 4th category we talked about with regard to shape was complex where
each part can have a different structure. Polymorphic means more than one
form.
Viruses that infect bacteria are called
a) bacteriophages.
b) prions.
c) viroids.
d) poxviruses.
a) bacteriophages.
Prions are proteinaceous infections particles that can cause illnesses like mad
cow disease and Creutzfeldt-Jakob disease in humans. Viroids are naked pieces
of RNA that can only infect plants at this point in time. Poxviruses are a class of
viruses that can cause smallpox in humans, cowpox in cows, etc. (but NOT
chickenpox in humans, that is a herpes virus).
Capsids are composed of protein subunits known as
a) capsomeres.
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b) spikes.
c) envelopes.
d) tail fibers.
a) capsomeres.
Spikes are projections from some virus particles that allow them to interact with
receptors on the host cell. Envelopes are lipid layers that some viruses pick up
from the host cell when they leave. Tail fibers were shown in the example of
bacteriophages, one type of complex virus.
What is the most common method used to identify viruses?
a) Serological methods
b) Observation of cytopathic effects
c) Polymerase chain reaction (PCR)
d) Morphology
a) Serological methods
Because viruses can only been seen under an electron microscope, morphology
(shape) is not a common way to identify them. The two ways mentioned in
lecture were serological and modern molecular methods. The most common are
serological, like an ELISA for example, but DNA and RNA methods including PCR
are also used. We haven't talked about cytopathic effects, but these are visible
changes to cells and tissues caused by some viruses. Again, not a common
method for identification because it is not specific to just one virus.
All of the following can be used to culture animal viruses EXCEPT
a) laboratory animals.
b) cell culture.
c) embryonated eggs.
d) glucose broth.
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