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Micro Biology > Viruses > Flashcards

Viruses Flashcards

1
Q

Viruses are_____

A

Small infectious agent that only replicates only in other organisms living cells,any stage of infection

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2
Q

Viruses consist of nucleic acid surrounded by protein coat named_____

A

Capsid

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3
Q

Viruses do not replicate only inside of____

A

Living cells

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4
Q

viruses have additional_______ envelope

A

Lipoprotein

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5
Q

Viruses do not multiple in______ media

A

Chemical defined media

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6
Q

Viruses do not undergo______fission

A

Binary

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7
Q

All of dem haploid execpt_____

A

Retroviruses

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8
Q

Picovirus contains___

A

RNA

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9
Q

Retrovirus has indirect synthesis of_____

A

DNA

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10
Q

1st step of viral multiplication is____

A

Absorption which is virion attachment proteins and reseptor host cells take role

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11
Q

In absorption, reseptors determines_____

A

Which cells can be infected by the virus

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12
Q

HIV has 3 host receptors which are

A

CD4 CXCR4 CCR5

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13
Q

Viroids are ?

A

Infectious circular RNA molecules that lack protein shell

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14
Q

Prions are composed of___and smaller than___

A

Protein, viruses

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15
Q

Prions are transmissible to_____

A

Animals

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16
Q

Prions tend to replicate to____

A

High titiers

17
Q

Bacteriophages are

A

Viruses that infect and replicate within a bacterium

18
Q

Bacteriophages genome may encode____

A

as few as 4 genes or as many as 100 of genes

19
Q

Bacteriophages are most_____ and diverse entities in the biosphere

A

Common

20
Q

In cytoplasm RNA viruses are produced except_____

A

Influenza and retroviruses

21
Q

In nucleus______ viruses produced except_______

A

DNA viruses, influenza, retroviruses
Poxviruses

22
Q

In 4th step of viral multiplication viral biosynthesis has 3 main events which is _____

A

I.genome synthesis
II.mRNA production
III.Protein synthesis

23
Q

Viral core is____

A

An acid genome in center of virion

24
Q

Viral core controls_____

A

Viral heredity and variation

25
Q

Viral core is responsible for

A

Infectivity

26
Q

Viral capsid is____

A

Protein shell or coat that encloses nucleic acid genome that protects viral nucleic acid

27
Q

Viral capsid participate in___

A

Viral infection

28
Q

Viral capsid shares____

A

Antigenicity

29
Q

Nucleocapsid is core of a virus particles that consist of_____

A

Genome plus a complex of proteins

30
Q

Nucleocapsid complex is made of

A

Structural protein+non-structural proteins(enzymes and nucleic acid binding proteins)

31
Q

symmetry of nucleocapsids?
hint:3 type exists

A

Helical
Cubic/icoashedral
Complex

32
Q

-virus particle is elongated or pleomorphic(not shaped) and nucleic acid is spiral
-caposomeres are arranged round the nucleic acid
which type of nucleocapsid symmetry is this?

A

Helical

33
Q

-polyhedron having 20 faces
-virus particle is in this specific shape and nucleic acid contained inside th capsid
-also this capsid composed of 20 eqilateral triangles
which type of symmetry is this?

A

Cubic or icoashedral

34
Q

-viruses which dont fit into category having helical or icoashedral capsid
Example:poxvirus(largest animal virus)
Which symmetry type is this?

A

Complex virus

35
Q

There are 3 virus-host cell interaction exists what are they ?

A

lytic(productive) response
nonlytic(nonproductive) response
oncogenic transformation

36
Q

-act as mRNA binds to ribosome and lead direct protein synthesis
-RNA is able to immediately transferred into proteins
-as such messenger RNA(mRNA) in th cell is positive strand
which type of RNA sense is this?

A

Positive sense

37
Q

-templates for production of mRNA
-RNA is not translatable into proteins it first has to be transcribed into positive strand RNA
Which type of sense RNA is this?

A

Negative sense

Micro Biology (7 decks)

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