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Ch. 18 vocabulary


Competent bacteria oly bacterial species that are competent can perform transformation--have special transport proteins in their membranes
Conjugation direct transfer of DNA from one bacterium to another
F- cells lack the F-factor
F+ cells cells carrying any F-factor--male cells--only mate with F- cells
F-factor on bacterium, the donor, contains plasmid--fertility factor--codes for pilus and other genes needed for DNA copy and transfer
Generalized transduction phages that can transfer any gene from donor bacterium
High frequency of recombination Hfr--F-factor integrates (inserts itself) into donor bacterial chromosome
pilus tip an attachment site or ligand for specific receptors on other bacteria that lack the F-factor
Specialized transduction phages that pick up just one area of donor bacterial chromosome--can transduce a limited number of bacterial genes
Transducing particles contains bacterial DNA (host DNA) rather than phage DNA--when infects another bacterium--no bacteriophage grows--phage's genes missing--transfer bacterial DNA from previous host to new cell--new DNA recombines to new cells chromosome
Transduction phage (bacterial virus) carries gene from one bacterium to another
Transformation transform the bacteria to a different genotype--able to transport DNA from the medium into their cytoplasm
Created by: heatherlvn