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(Graphic computer art by Daniel Yuen). A circular bacterial chromosome is a bacterial chromosome in the form of a molecule of circular DNA. Unlike the linear DNA of most eukaryotes, typical bacterial chromosomes are circular. Most bacterial chromosomes contain a circular DNA molecule â there are no free ends to the DNA. Free ends would otherwise create significant challenges to cells with respect to DNA replication and stability.
Number and shape: The number of chromosomes present in bacteria is only 1 and it is circular in shape (no ends). In humans 46 (23 pairs) of linear chromosomes are present. The ends of the linear chromosomes are called as telomeres. Amount of DNA present in a human cell is 1000 times the DNA present in a bacterial cell.