... Origin of Replication ( ori ) DNA sequence which directs initiation of plasmid replication (by bacteria...double-stranded DNA that typically carry genes and can replicate independently from chromosomal DNA. Although they...the bacterial chromosomal DNA, plasmid DNA is replicated upon cell division, and each daughter cell receives...manipulating genes. For instance, most plasmids are replicated in E. coli and are relatively small (∼3000 - ...sequences for this purpose, which includes a DNA replication origin, an antibiotic-resistance gene, and a ... exists extrachromosomally in E. coli , it is replicated independently and segregated to the resulting...form, plasmids require a bacterial origin of replication ( ori ), an antibiotic-resistance gene, and at...