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Viruses

Viruses
Edward Jenner began inoculating humans with material from __________ lesions.

Chickenpox
Avianpox
Cowpox
Smallpox

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Viruses
The temperate phage possesses a gene that codes for a repressor protein which makes the cell resistant to lysis initiated by

the prophage
lytic infection by other viruses
Both (a) and (b)
none of these

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Viruses
Which of the following viruses belong to family Hepadnaviridae?

Hepatitis B virus
Hepatitis A virus
Hepatitis D virus
All of these

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

differential centrifugation
none of these
precipitation
gradient centrifugation

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Viruses
The most popular indirect method of counting virus particles is by

colony counting
plaque-assay
hemagglutination assay
counting plaque-forming units

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Viruses
Which of the following viruses belong to family Flaviviridae?

Hepatitis C virus
Yellow fever virus
Rubella virus
All of these

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