Genetics of Bacteria 3 Flashcards
What are the 3 ways bacteria transfer genetic material?
- Conjugation
- Transduction
- Transformation
Conjugation
Involves a direct physical interaction between two bacterial cells where one bacteria cell acts as a donor & the other acts as the acceptor
Transduction
A virus infects a bacterium & then transfer bacterial genetic material from that bacterium to another
Transformation
Process where genetic material is relased into the environment when a bacterial cell dies & the genetic material is taken up by another bacteria cell
Episomes
Plasmids that can turn into a chromosome
Fertility plasmids (F factor)
Allows bacteria to conjugate with each other (A bacteria that doesnt have it can’t start conjugation process)
Resistance plasmids (R factor)
Contain genes that confer resistance agaisnt antiobiotics & other toxins
Degradative plasmids
Carry genes that enable the bacterium to utilize an ususual susbstance
Col-plasmids
Contains genes that encode colicins which are proteins that kill other bacteria
Virulence Plasmids
Carry genes that turn a bacterium into a pathogenic strain
Hfr Strains (Hugh frequency of recombinations)
Result when the bacterial DNA fragment is incorporated into the chromsome via homologous recombination
During cojugation of ________ the bacterial chromosome is transfered linerly to the recipient strain (transfer in order of genes)
Hfr
If conjugation occurs for a ___________ than the recipient cell recieves a short segement of chromosomal DNA from the donor
Short time
If conjugation is ____________ the recipient cell will recieve a longer segment of chromosomal DNA from the donor
Prolonged
Bacteriophages (Phages)
Viruses that bind to bacterial cells & infect them