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17 Cards in this Set

  • Front
  • Back
Protein subunit that makes up the capsid of a virus
Host Specific virus
viruses that will only infect a particular species
Tissue Specific Virus
Viruses of eucaryotic organisms that only infect certain types of tissues
Steps of virus infection
1. attachment
2. penetration
3. uncoating of virus
4. replication of virus DNA and protein
5. self-assembly
6. release from cell
types of virus penetration
1. phagocytosis - receptor mediated endocytosis
2. infection of nucleic acid
3. fusion if viral envelope with cell membrane, envelope aids entry into cell
dsDNA virus replication
uses host cell machinery to express viral genome and proteins transcription and translation are carried out
ssRNA virus replication
1. some function directly as mRNA and host mechanisms are used to translate
2. some serve as template with viral RNA polymerase to copy m-RNA and host mechanisms used to translate
reverse transcriptase enzyme used to make viral DNA from viral RNA as the template
types of viral release from host cell
1. bud through cell membrane
2. exocytosis in vesicle from golgi
3. rupture cell to release new virus particles
4. cell dies b/c functions for survival are not carried out and viruses escape when cell membrane disintegrates
infectios abnormally folded proteins
ability to take up "naked" DNA from environment and express genes
viruses carry bacterial genes from one host bacterium to another
generalized transduction
random inclusion of bacterial DNA into new virus particle during lytic cycle
specialized transduction
lysogenic virus reverst to lyctic cycle. as leaves host chromosome leaves out some host DNA as part of viral DNA and carries it into new viral particles and subsquently into new bacterial cells
direct transfer of genetic material from one bacterium to another
sex pili
appendages which can form a temporary cytoplasmic bridge b/t two bacteria and provide a way for the DNA transfer
pieces of DNA that can move from one location to another in a cell's genome