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Viruses

Viruses
Enveloped viruses have a __________ shape.

roughly spherical
helical
icosahedral
complex

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Viruses
In cell culture, measles virus may lead to

syncytium formation
rounding and aggregation of cells
transformation of cells
nuclear pyknosis

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Viruses
Inclusion bodies of measles virus are

intracytoplasmic
both (a) and (b)
none of these
intranuclear

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Viruses
The most popular indirect method of counting virus particles is by

colony counting
plaque-assay
counting plaque-forming units
hemagglutination assay

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Viruses
The viral DNA of the temperate phage, instead of taking over the functions of the cell's genes, is incorporated into the host DNA and becomes a prophage in the bacterial chromosome, acting as a gene. This happens in

lytic phase
none of these
spontaneous induction
lysogeny

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Viruses
The viral DNA is removed from the host's chromosomes and the lytic cycle occurs. The process is called

spontaneous induction
spontaneous infection
inductive infection
resultant induction

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