Chapter 17 Flashcards

1
Q

virus

A

infectious particle consisting of little more than genes packaged into a protein coat

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2
Q

capsid

A

protein shell that encloses the viral genome

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3
Q

capsids are built from protein sub units called?

A

capsomeres

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4
Q

viral envelopes are derived from?

A

host cells membrane and contain a combo of viral and host cells molecules

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5
Q

bacteriophages

A

viruses that infect bacteria

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6
Q

viruses are ___ because they can___.

A

obligate intracellular parasites, replicate only within a host cell

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7
Q

host range

A

limited number of host species that it can infect

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8
Q

viral infections of multicellular eukaryotes are limited to?

A

particular tissues

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9
Q

lytic cycle

A

phage replicative cycle that culminates in the death of host cell.

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10
Q

lytic cell produces ___ and lyses the ___

A

new phages, the host cell wall

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11
Q

virulent phage

A

phage that reproduces only by lytic cycle

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12
Q

lysogenic cell

A

replicates the phage genome without destroying the host

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13
Q

temperate phages

A

phages that use both lytic and lysogenic cycles

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14
Q

The viral DNA molecule is incorporated into the ____ during lysogenic cycle.

A

host cell’s chromosome

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15
Q

prophage

A

integrated viral DNA

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16
Q

Every time a host divides it?

A

copies the phage DNA and passes the copies to daughter cells

17
Q

An environmental signal can trigger the viruses genes to ?

A

exit the bacterial chromosome and switch to lytic mode

18
Q

Phage DNA is often identified as __ and cut up by ___

A

foreign, restriction enzymes

19
Q

Retroviruses use __ to copy their RNA genome into DNA

A

reverse transcriptase

20
Q

Human immunodeficiency virus

A

retrovirus that causes acquired immunodeficiency syndrome

21
Q

Provirus

A

viral DNA that is integrated into the host genome

22
Q

A provirus is a permanent?

A

resident of the host cell

23
Q

RNA molecules function both as?

A

mRNA for synthesis of viral proteins and genomes for new viruses.

24
Q

Mobile genetic elements

A

plasmids, transposons, and viruses

25
Q

vaccine

A

harmless derivative of pathogen that stimulates immune system to mount defenses against the pathogen

26
Q

epidemic

A

general outbreak

27
Q

pandemic

A

global epidemic

28
Q

H1N1 identifies forms of 2 viral surface proteins __ and ____

A

Hemagglutinin (H) and Neuraminidase (N)

29
Q

What has allowed mosquitoes carrying dengue fever to move to new locations?

A

climate change

30
Q

prions

A

proteins that are known to be infectious

31
Q

Prions can be transmitted in?

32
Q

Prions incubation period can be at least?

33
Q

Prions are virtually ___.

A

indestructible