How is DNA in bacteria usually shaped?
Bacteria are prokaryotes, that is, the DNA molecule is not enclosed in a membrane-bound nucleus as it is in the eukaryotes. In bacteria the DNA lies free in the cytosol in a region known as nucleoid. This is denser than the rest of the cytosol because of the presence of DNA and related protein molecules. Also the DNA in bacteria is not broken up in thread-like chromosomes but is a ring-like circular and continuous structure.