Transposons are
Transposons are segments of DNA that can move around to different positions in the genome of a single cell. In the process, they may cause mutations increase (or decrease) the amount of DNA in the genome of the cell, and if the cell is the precursor of a gamete, in the genomes of any descendants. These mobile segments of DNA are sometimes called "jumping genes". Ref-Sathyanarayana 4/e
Jumping genes
Cosmid
Episome
None
Metabolism of nucleic acids