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Viruses

Viruses
Which of the following are obligate intracellular parasites?

Viruses
Chlamydia
Rickettsia
All of these

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Viruses
The time from infection until lysis is called as

rise period
eclipse period
latent period
burst size

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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

C
D
A
B

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Viruses
Which of the following may affect proteins and nucleic acids, but not viruses?

Denaturation
Pressure
Enzyme treatment
All of these

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Viruses
The envelope of an enveloped virus is derived from

the cell membrane
none of these
the endoplasmic reticulum of the cell
the mitochondrion of the cell

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Viruses
Which of the following disinfectant is effective against viruses?

Hypochlorite
Hydrogen peroxide
All of these
Formaldehyde

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