Number of chromosomes in bacteria Chromosome Species number Mbp Proteobacteria Vibrio cholerae 3.0&1 Rhodobacter sphearoides 3.1&0.9 Burkholderia cepacia 3.5,3.0&1.0 Brucella suis 223332 3.2,2.0&1.1 Rhizobium meliloti 3.5,17&1.4 Agrobacterium tumefaciens 3.0&2.1 Other examples Die enococcus radiodurans 2 2.6&0.41 Borrelia burgdorferi >7(2)0.9t00.026 Leptospira interrogans 4.5&0.35 Red- rRNA genes on multiple chrms Green-important housekeeping genes on multiple chrms Blue- similar replicons present in all natural isolates