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Classification Of Virus Flashcards

1
Q

Viruses are?

A

Obligate Intracellular parasites

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2
Q

Viruses are the _______ infectious agents ranging from ___to ___ nm in diameter

A

Smallest
20-300

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3
Q

Viruses contain only one kind of ______

A

Nucleic acid
Dna/ RNA but not both

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4
Q

__________ contains information to initiate and complete an infectious cycle within a cell

A

Viral genome

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5
Q

How are viruses transmitted from one host to another and establish themselves so survival is ensured

A

Viral Genome

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6
Q

What are the 5 classifications of virus genome properties

A

Type of nucleic acid
Size of genome
Strandedness; linear or circular
Sense (positive, negative, ambisense)
Segments (number & size)

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7
Q

Classification of viral morphology include

A

Size
Shape
Type of symmetry

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8
Q

Physio chemical properties of viruses (reliable modern satisfactory parameters) include

A

Molecular mass
Buoyant density
pH stability
Thermal stability
Susceptibility to physical and chemical agents (Ether & detergents)

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9
Q

Crude classification of viruses uses parameters like

A

Host

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10
Q

Other criterias for virus pathogenicity are

A

GIT
CNS

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11
Q

Ecological criteria for classifying virus:

A

Mode of transmission
Vectors
Reservoirs

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12
Q

What is the name of global committee for viral nomenclature

A

ICTV
INTERNATIONAL COMMITTEE ON TAXONOMY OF VIRUSES

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13
Q

Suffixes of
Order
Family
Sub family
Specie

A

VIRALE
VIRIDAE
VIRINAE
VIRUS

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14
Q

How many families of DNA and RNA families are recognized in humans

A

7 DNA families
14 RNA families

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15
Q

Classify Ebola Virus

A

Order: Mononegavirales
Family:Filoviridae
Genus: Ebolavirus
Species: Ebolavirus zaire, Ebola Sudan, Ebola Tai forest, Ebola Bundibugyo

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16
Q

Classify Herpes Simplex

A

• Order: Herpesvirale
• Family: Herpesviridae
• Subfamily: Alphaherpesvirinae
•Genus: Simplexvirus
• Species: Herpes Simplex virus type 1

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17
Q

What are Arbo viruses

A

ARthropod BOrne Viruses

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18
Q

All DNA viruses are double stranded except

A

PARVO Virus

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19
Q

Circular DNA viruses are

A

Papilloma
Polyoma
Hepadna

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20
Q

The biggest DNA virus that replicates in the cytoplasm is

A

POX VIRIDAE

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21
Q

Hepatitis B virus is in which family

A

Hepadna viridae

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22
Q

Hepatitis E virus is in family

A

Calci VIRIDAE (rna)

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23
Q

Ebola virus and Yellow fever virus belong to families

A

Filoviridae

Flaviviridae

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24
Q

An example of ReoViridae is

A

Rota Virus

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25
Q

Retro viridae is unique in that

A

Replication is unique: the horizon contains a reverse transcriptase enzyme that produces a DNA copy of the RNA genome
Eg HIV, HTLV

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26
Q

All rna viruses are single stranded except

A

Reo viridae

27
Q

Which dna virus takes its envelope from the nuclear membrane

A

Herpes Viridae

28
Q

Pox symmetry

29
Q

Segmented RNA viruses include

A

Orthomyxo Influenza
Reo Viridae
[Arena
Bunya]

30
Q

Enveloped DNA Viruses are

A

Hepadna
Herpes
Pox

31
Q

Do viruses undergo binary fission

32
Q

All helical viruses are

33
Q

+ve sense rna virus include

A

Calici
Picorna

Corona
Flavi
Toga
Retro viridae

Negative: Old Pete Rabid dog FILO feeds BUNYo in ARENA

34
Q

3 non enveloped rna virus

A

Picorna
Calici
Reo

35
Q

All rna virus undergo replication in the cytoplasm except 2

A

Retro
Orthomyxo viridae

36
Q

In Dna/rna which replicates more easily

37
Q

Which rna virus family is ambisense

A

Arena virus

38
Q

Example of parvoviridae

A

Human parvovirus B19

genus: Parvovirus, Erythrovirus, Dependovirus

39
Q

Example of polyoma virus

A

JC virus
BK virus

40
Q

Eg of Papillomaviridae

A

Human papillomavirus (over 100 genotypes)

41
Q

Adenoviridae eg

A

Human adenoviruses (51 types)

genus:Mastadenovirus e.g Human Adenovirus(several serotypes)

42
Q

Hepadnaviridae

A

Hepatitis B virus

Genus: Hepadnavirus e.g Hepatitis B virus

43
Q

Herpesviridae

A

Varicella-Zoster virus, Human Cytomegalovirus

Genus: Simplex virus,
Varicello virus, Cytomegalovirus,
Roseolovirus
,Lymphocrypto virus

44
Q

POxviridae

A

Small pox

genus: orthopox,suispox,avipox,mollusci pox

45
Q

List the positive sense rna dividing it between
Naked & Enveloped

A

Naked:
Caliciviridae
Picornaviridae

Enveloped:
Coronaviridae
Flaviviridae
Togaviridae
Retroviridae

46
Q

Negative sense rna

A

Bunya
Arena
Fill
Paramyxo
Orthomyxo

47
Q

Arenaviridae-

A

genus: Arenavirus e.g Lassa , Mopeia, Junin, Machupo

48
Q

Astroviridae-

A

genus:Astrovirus

49
Q

Bunyaviridae-

A

genus: Bunyavirus, Nairovirus, Hantanvirus, Phlebovirus

50
Q

Caliciviridae-

A

genus:, Norwalk, Hepatitis E virus

51
Q

Coronaviridae-

A

genus:Coronavirus, SARS virus

52
Q

Filoviridae-

A

genus:Ebola, Marburg

53
Q

Flaviviridae-

A

genus: Yellow fever virus
dengue virus
West nile virus
Hepatitis C Virus

54
Q

Orthomyxoviridae-

A

genus:
Influenza virus A,B,C

55
Q

Paramyxoviridae-genus:

A

Parainfluenza,
Human metapneumovirus
Mumps
Measles
respiratory syncytial viruses

56
Q

Picornaviridae-genus:

A

Enterovirus
,Hepatovirus,
Rhinovirus

57
Q

Reoviridae-

A

Genus: Rotavirus

58
Q

Retroviridae-

A

genus:Lentivirus,
(spp – HIV)
HTLV

59
Q

Rhabdoviridae-

A

genus: Rabies virus, Lyssavirus, Vessiculovirus

60
Q

Togaviridae-

A

genus: Alphavirus (Chikungunya), Rubivirus (Rubella virus)

61
Q

Most viruses derive their envelope from the cell’s outer membrane with the exception of

A

Herpesviruses
Derive theirs from cell’s nuclear membrane

62
Q

All RNA viruses are single stranded except

A

Reoviridae ds

63
Q

Segmented genome are found in

A

Reo virus ds
Bunya
Orthomyxo
Paramyxovirus

FPP Micro (5 decks)

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