| The bacterium contains a plasmid, a circular piece of DNA that holds the gene and promoter sequence. |
| Consequently, the conjugational activity can be low when most cells carry the plasmid but increase greatly in response to plasmid-free cells. |
| Molecular access to the sda gene was via the sda HZ.P1 mutation by the method of plasmid rescue of genomic DNA flanking the transposon insertion. |
| The distribution of 2 plasmid DNA topoisomers was measured by Southern blot analysis with a radiolabeled 2 DNA probe. |
| Like bacteria, archaeans have no internal membranes and their DNA exists as a single loop called a plasmid. |
| Clearly, quenchable free radicals are the primary source of plasmid nicking in the purified solutions. |
