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Viruses

Viruses
Which of the following virus is enveloped?

Adeno
Polio
None of these
Herpes

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Viruses
Which one is not useful in the treatment of viruses except

penicillin
acyclovir
antibodies
interferon

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

none of these
gradient centrifugation
precipitation
differential centrifugation

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Viruses
The lysogenic state is governed by the activity of the regulatory region of the lambda phage genomes; this region is termed as

operon repressor
none of these
immunity repressor
immunity operon

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

penetration
adsorption
replication
absorption

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Viruses
In the simplest capsid, there is a capsomere at each of the 12 vertices; this capsomere, which is surrounded by five other capsomeres, is termed a

helical
icosahedral
polyhedra
penton

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