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.
Plasmids have been key to the development of molecular biotechnology. They act as delivery vehicles, or vectors, to introduce foreign DNA into bacteria. Using plasmids for DNA delivery began in the 1970s when DNA from other organisms was first âcut and pastedâ into specific sites within the plasmid DNA.acterial DNA â a circular chromosome plus plasmids. The DNA of most bacteria is contained in a single circular molecule, called the bacterial chromosome. The chromosome, along with several proteins and RNA molecules, forms an irregularly shaped structure called the nucleoid.