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recombination conjugation transormation transduction
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recombination
eukaryotic occurs during meosis
prokaryotic occurs when dna is transfered from donor to recepient cell
recombination steps
donor dna alligns with recepient cell
bases align and RecA catalyzes strands
recipient chromosome contains new DNA
cojugation
requires direct cell to cell contact and opposite mating types
donor cells carry plasmids
recipient cells dont
sex pilli
for gram - cells
projections from the donor cell to get in direct contact with recipient cell
for gram + cells
produce sticky molecules to bring cells into direct contact
high frequency conjugation
f+ cell (donor) - recombiation with chromosome produces a Hfr cell
low frequency conjugation
f+ cell transfer plasmid to f- cell which results in a f+ cell
transformation
genes are transfered from one bacterium to another as naked DNA in a solution
transformation steps
recipient cell takes up donor DNA
bases align
recombination occurs between donor and recipient DNA
outcome is a genetically transformed cell
transduction
bacteria DNA is transferred from a donor cell to a recipeint cell inside a virus that infects bacteria; bacteriophage
transduction steps
phage infect donor bacteria cell
chromosome broken to peices so assembly of some bacterial DNAare packed and released after death of cell
bacterial DNA phage infects new host cell
recombination produces normally
constitute
gene always turned on
represssion
gene normall turned on but can be turned off in response to metabolic signal
induction
gene is normally turned off but can be turned on in response to metabolic signal
repressors
regulatory mechanism that inhibits gene expression and decreases enzyme sysnthesis
Author
andreathors16
ID
150849
Card Set
recombination conjugation transormation transduction
Description
test 3
Updated
2012-04-29T05:11:28Z
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