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Viruses

Viruses
Which of the following bacteriophage is said to have banal symmetry?

T6
all of these
T2
T4

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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

immunity repressor
operon repressor
none of these
immunity operon

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Viruses
The bacterial viruses having head made up of large capsomeres, but no tail is morphologically classified as

B
D
C
A

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Viruses
The viruses in an attenuated vaccine

are usually larger than bacteria
have no genome
is altered with chemicals
continue to replicate

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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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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

latent period
rise period
burst size
eclipse period

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