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11 Cards in this Set

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  • Back
Cells
-have cytoplasmic membrane which is selective permeable
-plant and bacteria cells have a cell for protection
Viruses
-have no cell wall
They are simple genetic material either RNA or DNA( never both like humans)
Capsid
-mostly composed of liquid
-Some more advanced viruses have an outer envelope in addition to the protein coat shich is necessary for infectivity
-their subunits are made of capsomeres
Intracellular parasites
Viruses are these which menas they can only live (replicate) inside living cells
-they do so at living cells own expense which leads to cell death
True / False
Viruses cannot be grown on artificial media like agar and broth
True
Plaques
When viruses kill cells in tissue cultures tiny holes are made in the monolayer
-These can be seen under a microscope
-one plaque starts from one virus
Plaque formation
CPE = cytopathic effect
Lytic cycle
The virus enters the cells, sheds its coat uses the cells machinery to copy its nucleic acid and its protein coat: many mature viruses emerge from the dying cell and spread to neighboring cells to do the same
Lysogenic
the virus enters the cell and does not replicate, instead its nucleic acid is incorporated into the nucleic acid of the cell. Then later can go lytic
Prion
The prion has no nucleic acis it is just protein
-it is another life form simpler than the virus
CJD
Creutzdeldt - Jakob disease