Tranposable elements are mobile DNA. Sometimes they are called jumping genes. There are two classes of transposable elements in eukaryotes. Class I retrotransposons (either flanked by long terminal repeats or simple repeats) must make an RNA intermediate to facilitate integration into a genome. Class II DNA transposons, which are flanked by short terminal repeats, can directly insert into the genome without an RNA intermediate.
Class I (copy paste transposons):
Ty element (yeast), LINES (humans)
Class II (cut and paste transposons):
Ac/Ds (plants), Spm/dSpm (plants), Mariner-like (many species), P element (Drosophila)
In E. coli, Tn family of transposons often carry antibiotic resistance genes. They ...
Short review of transposable elements in E. coli, yeast, plants, animals, and Drosophila. Web references provided.