<prompt> Plasmid DNA-Chromosomal DNA combines to form:MesosomeRibosomeTransposonEpisome  <response>: Ans: D Episome Ref: Anonthanarayan, Paniker CJ. Textbook of microbiology. 8th Edition. London: John Wiley Sons: 2009. Pg. 60. 67Explanation:Plasmid DNA may sometimes be integrated with chromosomal DNA are known as EpisomeTransposonsThey are structurally and genetically discrete segments of DNA that have the ability to move around in a cut-and-paste manner between chromosomal and extrachro moso mal DNA molecules within cells.A transposon is a segment of DNA with one or more genes in the centre, and the two ends carrying inverted repeat sequences of nucleotides-nucleotide sequences comple mentary to each other hut in the reverse order.They are also known as jumping genes. 