<prompt> Most commonly used vector for DNA cloning -PlasmidVirusCosmidPhage  <response>: Ans. is a i.e.. Plasmid o 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.o The five major types of cloning vectors used are -PlasmidsViral vectorsBacteriophagesCosmidsBacterial Artificial Chromosomes BACsYeast artificial chromosomes YACso Most commonly used vectors are plasmids. 