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Viruses

Viruses
Enveloped viruses have a __________ shape.

roughly spherical
helical
complex
icosahedral

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

gradient centrifugation
precipitation
differential centrifugation
none of these

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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

none of these
immunity repressor
operon repressor
immunity operon

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Viruses
The time from infection until lysis is called as

eclipse period
burst size
latent period
rise period

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Viruses
During the first 10 minutes after injection of phage DNA, no phage can be recovered by disrupting the infected bacterium. This is termed as

eclipse period
burst size
rise period
latent period

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Viruses
The most complex type of bacterial viruses having hexagonal head, a rigid tail with a contractile sheath and tall fibers is morphologically classified as

A
B
C
D

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