<prompt> Most commonly used vector for DNA cloning ?PlasmidVirusCosmidPhage  <response>: A cloning vector is a carrier DNA molecule to which human DNA fragment is attached. Normally, foreign DNA fragments cannot self-replicate within host cell. Therefore, they are joined to a vector DNA, that can replicate within host cell.The five major types of cloning vectors used are -i Plasmidsii Viral vectorsBacteriophagesiii Cosmidsiv Bacterial Aificial Chromosomes BACsv Yeast aificial chromosomes YACs 