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Viruses, viroids, and prions

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created 1 year ago by babyruby
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updated 1 year ago by babyruby

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1

Viruses possess genetic material comprised of

DNA or RNA

2

A double-stranded, enveloped DNA virus that contains reverse transcriptase belongs to which family

hepadnaviridae

3

which of these processes of viral multiplication is most likely to damage the host cell?

release of viruses

4

members of adenoviridae cause

the common cold

5

which of the following are possible strategies for treating viral infection

blocking viral attachment to host cell receptors

blocking uncoating of the viruse after entry

blocking insertion of viral DNA into the host cell chromosomes

blocking biosynthesis of viral nucleic acids

ALL THE ABOVE

6

which method cannot be used to culture viruses in a lab

nutrient agar culture media

7

cell lines derived from transformed (cancerous) cells are called

continuous cell lines

8

an example of a latent virus infection is

shingles

9

during the bacteriophage lysogenic cycle

phage DNA is inserted into the host chromosome

10

a virus may contain any of any of the following except

ribosomes

11

after the attachment and entry of a virus into a host cell, what is the next step in the multiplication of animal viruses

uncoating

12

viruses that use RNA as a template for transcribing DNA include

retroviridae

13

in polio virus replication, the function of the antisense (-strand) RNA is to

serve as a template for the production of sense (+strand) RNA

14

which of the following statements about spikes is false

they are used for penetration

15

all of the following are RNA viruses except

hepatitis B virus

16

which of the following is NOT used as a criterion to classify viruses

biochemical tests

17

which of the following statements provides the most significant support for the idea that viruses are nonliving chemicals

they cannot reproduce themselves outside host

18

which of the following is NOT a method of culturing viruses

in culture media

19

bacteriophages and animal viruses do NOT differ significantly in which one of the following steps

biosynthesis

20

a clear area against a confluent "lawn" of bacteria is called a

plaque

21

the definition of lysogeny is

phage DNA is incorporated into host cell DNA

22

continuous cell lines differ from primary cell lines in taht

continuous cell lines can be maintained through an indefinite number of generations

23

a viroid is

a nonenveloped, infectious piece of RNA

24

a persistent infection is an infection in which

the disease process occurs gradually over a long period

25

which of the following would be the first step in biosynthesis of a virus with a -strand of RNA

synthesis of double-stranded RNA from an RNA template

26

the most common route of accidental AIDS transmission of health care workers is

needlestick

27

an infectious protein is a

prion

28

some viruses, such as human herpesvirus 1 infect a cell without causing symptoms; these are called

latent viruses

29

an enveloped is acquired during which of the following steps

release

30

the following steps occur during multiplication of retroviruses. what is the fourth step

synthesis of double-stranded DNA

31

viruses are considered obligatory intracellular parasites because

they require a host cell in order to multiply

32

characteristics of viruses

contain either DNA or RNA

contain protein coat

multiply inside living cells

causes specialized structures to transfer nucleic acids to other cells

lack enzymes for protein synthesis and ATP generation

33

define host range

the spectrum of host cells the virus can infect

34

what is a bacteriophage

card image

viruses that infect bacteria

35

an infectious viral particle composed of nucleic acid and surrounded by a protein coat is

a virion

36

caspid

protein coat which protects the nucleic acid of a virus

37

capsomeres

protein subunits caspids are composed of

38

helical viruses

long rods, may be rigid of flexible

ebola and rabies

39

polyhedral

many-sized viruses

40

enveloped viruses

roughly spherical. caspid is covered by an envelop

influenza virus

41

complex virus

complicated structure

bacteriophage

42

nonenveloped virus

caspid aren't covered by an envelope

43

taxonomy of viruses

virus - genus names

viridae - family names

44

viral species

viruses sharing the same genetic info and ecological niche

45

plaques

number of clearings

46

Plaque-forming units

concentrations of viral suspensions measured by the number of plaques

47

where do they grow animal viruses in the lab

in living animals

in embryonated eggs

in cell cultures

48

cell deterioration is known as

cytopathic effect

49

adenoviridae

mastadenovirus

causes various respiratory infections

50

papovaviridae

papillomavirus

warts and cervical and anal cancer

51

poxviridae

molluscipoxvirus

smallpox and cowpox

52

herpesviridae

simplexvirus (HHV-1), varicellovirus (HHV-3)

fever blisters, chicken pox, shingles, etc

53

hepadnavirus

hepatitis B virus

54

picornaviridae

hepatitis A virus

55

togaviridae

rubivirus

56

rhabdoviridae

causes rabies and various animal diseases

57

filoviridae

enveloped, helical viruses

ebola

58

paramyxoviridae

morbillivirus

measles virus

59

orthomyxoviridae

influenza A, B, and C viruses

60

retroviridae

oncoviruses

leukemia and tumors

61

what are the two alternative mechanisms of bacteriophage multiplication

lytic cylce and lysogenic cycle

62

lytic cycle

card image

end with lysis and death of host cell

63

lysogenic cycle

card image

host cell remains alives

64

persistent viral infection

occurs gradually over a long period

65

latent infection

infection of the skin which produces cold sores.

66

latent and persistent viral infections

card image
67

positive stranded RNA virus

can synthesize proteins

68

negative stranded RNA virus

cannot be synthesized


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