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viruses
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obligate inracellular parasite
requiree a living host cell in order to muliply
viruses are non living becuase
they cant reproduce on their own
viruses contain
either DNA or RNA covered by a protien coat
viruses muliply
inside living cells by using the synthesizing metabolic machinery of a cell to transfer the viral nucleic acid to other cells
host range
range of cells/tissues viruses can infect
host range dertermined
by a receptor found on the cell surface
viruses can only infect a specific type of tissue within a host cell
viral size determined
by electron microscopy. 20 to 100nm
cannot be seen under a microscope.
interferon
antiviral protien
alpha, beta, gamma
inferons produced by
a virus infected cell and migrate to uninfecceted cells taht then produce antivral protiens
host cell specific
phage replication
attachment
penetration
biosynthesis
maturation
release
attachment
bateriophage attaches to cell wall
penetration
phage makes opening in cell and injects DNA
biosynthesis
phage DNA directs synthesis of viral protien and nucleic acid
maturation
viral compnents are assembed into virons
release
host cell dies and virions are released into surrounding medium
lysogeny
instead of biosynthesis maturation and relase
nucleic acid is integrated into genome becomeing a prophage
prophage
inserted phage DNA O
anamil virus replication
attachment- uses receptors on cell sufaces often using spikes on a virus
penetration- whole virus enerts cell via endocytosis
uncoating- virus capsid is removed
biosynthesis- transcription produce virus enzymes, viral nucleic acid, and capsid protiens
maturation- virus particles are assembled
release- virus particles are exposed
biosynthesis of RNA viruses
produce reverse transcriptase to make cDNA
dna then directs synethesis of viral components
attachment
entry and uncoating
RNA replication by RNA polymerase
translation and synthesis of viral protiens
maturation and release
cancer causing viruses
first identified in chickens
genes derviced originally from host
cancer causing process- transformation
Author
andreathors16
ID
155277
Card Set
viruses
Description
final exam
Updated
5/22/2012, 7:59:02 PM
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