I found this here.
Eukaryotic chromosomes are always linear. ... In contrast, prokaryotic chromosomes are either completely devoid of centromeres or carry the so-called “plasmid centromeres” which are not essential (with a few exceptions, such as Caulobacter) (57,–60).
What does it mean by prokaryotic chromosomes carry "plasmid centromers"? Their chromosomes carry the centromeres of plasmids? Do they have centromeres or not?
No, prokaryotes do not have centromeres. They do, however, generally have a somewhat analogous structure used during cell division to partition the replicated chromosomes and plasmids between the two daughter cells. The analogous place on the chromosome or plasmid is the parS element, a DNA sequence on the chromosome or plasmid which is part of the parABS system. This system, consisting of two proteins (parA and parB) along with parS, forms a mechanism to segregate the copies of a chromosome or plasmid for the daughter cells.
parS is usually called a "centromere-like" site, but is sometimes referred to as a "plasmid centromere”, which is why the quote uses the phrase so-called “plasmid centromeres”.
