For population 25 years and over in Revere: 1  High school or higher: 82.2%. 2  Bachelor's degree or higher: 19.5%. 3  Graduate or professional degree: 6.2%. 4  Unemployed: 5.7%. 5  Mean travel time to work (commute): 33.2 minutes.
Plasmids are extra chromosomal, double stranded, circular DNA molecules present in bacteria. Different kinds of bacterial plasmids based on encoded genes (their roles). F-plasmids (fertility factor or sex factors): Bacterial cells with F plasmids are called F+ cells and acts as donor cells or +strain during bacterial conjugation.
In their simplest form, plasmids require a bacterial origin of replication, an antibiotic resistance gene, and at least one unique restriction enzyme recognition site. These elements allow for the propagation of the plasmid within bacteria, while allowing for selection against any bacteria not carrying the plasmid. Self-replicating-Once you have constructed a plasmid, you can make an endless number of copies of the plasmid by growing the plasmid in bacteria. 2  Stable-Plasmids are stable long-term either as purified DNA or within bacteria (as glycerol stocks).