Lecture 1 Flashcards

1
Q

What is a virus

A

Smallest infectious agents and scrapie

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2
Q

What does a virus consist of

A

1 or more molecules of only one type of nucleic acid - protective protein shell

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3
Q

What are some viruses enclosed within

A

An envelope that contains both protein and lipid

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4
Q

What are the characteristics of viruses (3)

A
  1. They are all obligate intracellular parasites
  2. Unique way of replication
  3. Programs the infected cell
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5
Q

What is a virus structure

A

(refer to lecture notes)

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6
Q

What viruses have helical symmetry

A

Rhabdoviruses

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7
Q

What viruses have complex symmetry

A

Large viruses

- Poxviruses

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8
Q

How can viruses mature

A

Budding though a membrane and acquiring a lipid envelope of host origin

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9
Q

What are embedded in a viral envelope

A

Glycoproteins

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10
Q

What does viral nucleic acid play a vital role in

A

Replication

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11
Q

What are viral proteins

A

A structural/non-structural protein. Structural proteins are those that can be incorporated into virison

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12
Q

Function of viral proteins (structural) (4)

A
  1. Protect viral gnome
  2. Assist in the attachment of virus particles to a susceptible host cell
  3. Acts as immunological antigens
  4. Give structural symmetry
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13
Q

Function of non-structural viral proteins

A
  1. Enzymes form replication cycle and enzymes such as reverse transcriptase
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14
Q

What is an Arbovirus

A

Arthropod-borne virus

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15
Q

What are prions

A

The transmissible agent responsible for subacute spongiform encephalopathies

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16
Q

What do prions not include

A

Nucleic acid

17
Q

What is capripoxvirus transmitted by

A

Ticks

18
Q

Can viruses contain both RNA and DNA

A

No

19
Q

What is a capsid

A

Protein membrane

20
Q

What does the capsid protect

A

Nucleic acid

21
Q

What virus have 2 concentric shells

A

Reoviridae

22
Q

How many different morphology do viruses have

A

5

23
Q

Where do viruses usually get their envelope

A

Membrane from the host cell

24
Q

How does the virus escape the cell

A

Via budding

25
Q

What are non-structural proteins

A

Enzymes