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Viruses

Viruses
Viruses require __________ for growth.

animals
plants
living cells
bacteria

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Viruses
Viruses can be purified based on their size and density by using

precipitation
differential centrifugation
gradient centrifugation
none of these

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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

spontaneous induction
lytic phase
none of these
lysogeny

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Viruses
Which of the following viruses are relatively thermostable?

Hepatits A virus
Rubella virus
Human immunodeficiency virus
Influenza virus

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Viruses
Plant viruses may be cultivated in

tissue culture
whole plants
cultures of separated cells
all of these

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Viruses
The first step in infection of a host bacterial cells by a phage is

replication
adsorption
penetration
absorption

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