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Viruses

Viruses
Which of the following are obligate intracellular parasites?

Chlamydia
Viruses
Rickettsia
All of these

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

replication
penetration
adsorption
absorption

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Viruses
The most efficient way to enclose a space is within a/an

helix
icosahedron
sphere
cube

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Viruses
The viral DNA of the temperate phage, instead of taking over the functions of the cell's genes, is incorporated into the host DNA and becomes a prophage in the bacterial chromosome, acting as a gene. This happens in

lytic phase
spontaneous induction
lysogeny
none of these

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Viruses
Inclusion bodies of measles virus are

none of these
intranuclear
intracytoplasmic
both (a) and (b)

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

Smallpox
Avianpox
Chickenpox
Cowpox

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