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Viruses

Viruses
Which of the following are obligate intracellular parasites?

All of these
Viruses
Chlamydia
Rickettsia

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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
spontaneous induction
lysogeny
none of these

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Viruses
Which of the following viruses belong/s to family caliciviridae?

Hepatitis E virus
Hepatitis D virus
Hepatitis B virus
All of these

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Viruses
The infected cells continue to reproduce themselves as well as the virus, and the mature virions are extruded from the cell surface continuously over a long period of time. This type of release mechanism is called a

productive infection
inductive infection
all of these
resultant infection

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Viruses
In cell culture, measles virus may lead to

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

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

absorption
replication
adsorption
penetration

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