Plasmids are independently replicating units
of DNA in bacterial cells. Some plasmids are circularly
closed, whereas others may be linear. Some plasmids
contain the genetic information for their mobilization
and/or transfer, which involves formation of the DNA
pore or pilus and transfer of (usually) a single-stranded
molecule of the plasmid into the recipient cell. Plasmids
seem to be normal residents of bacterial cells and express
enormous varieties of host ranges.
용도
plasmids (with the naphthalene pathway genes), plasmids
for 2,4-D degradation, for alkane, for dichloromethane,
for haloalkane, for toluene sulfonate, for chlorobenzoate,
or for chlorobenzene degradation. Most of these plasmids
were shown to be transmissible in the laboratory.
