Viruses Flashcards
What is viruses’ size ?
10-300nm
What is the enzyme carried by negative polarity RNA viruses?
RNA dependant RNA polymerase
What capsid shape is commonly referred to as “spherical” ?
Icosahedral
What capsid shape is commonly referred to as “Rod shaped”?
Helical
Which is more virulent; Enveloped or Naked viruses?
Naked
What is the most famous example of a localised infection?
A common cold
Give an example of a virus exclusive to humans?
Measles
T/F; Cells concentration affects adsorption rate?
True
How many receptors does a cell have on its surface?
10^4 ~ 10^5
What does a virus envelope consist of?
Lipoproteins
(host cell lipid + viral proteins)
What feature of herpes virus causes tzanck cell ?
It penetrates using cell membrane fusion leaving its envelope behind
How can viruses leave the cytoplasmic vesicle after viropexis?
Acidity change or endosomal lysis
How can viral genome leave the Capsid in the cell?
Acidity change or digestion by cytoplasmic protease
Which step in virus Pathogenesis do we target for vaccines ?
Adsorption
Which step in virus pathogenesis is not targeted by scientists at all?
Assembly
T/F; chickenpox is caused by poxviridae ?
F; it is caused by HHV3 (Varicella-zoster virus)
Poxviridae includes ……..?
(2 examples)
Vaccinia
Variola
Polygraphs from 1400 BC revealed clinical signs of paralytic ……….?
Poliomyelitis
Ramses V died because of ……..?
Smallpox
Does deltaviridae have an enzyme?
It’s unknown
Only ds rna virus?
Reovirus
Only ss dna virus?
Parvovirus
What 2 viruses combined to form swine flu?
Bird flu & human virus
HHV1 =
HSV1
