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the DNA is often densely packed and organized; in the case of archaea, by homology to eukaryotic histones, and in the case of bacteria, by histone-like proteins.

Bacterial chromosomes tend to be tethered to the plasma membrane of the bacteria.

Diagram of a replicated and condensed metaphase eukaryotic chromosome.

(1) Chromatid – one of the two identical parts of the chromosome after S phase. A chromosome (from ancient Greek: χρωμόσωμα, chromosoma, chroma means colour, soma means body) is a DNA molecule with part or all of the genetic material (genome) of an organism.

Prokaryotic chromosomes and plasmids are, like eukaryotic DNA, generally supercoiled.The DNA must first be released into its relaxed state for access for transcription, regulation, and replication.Chromosomes in eukaryotes are composed of chromatin fiber.The nucleoid is a distinct structure and occupies a defined region of the bacterial cell.This structure is, however, dynamic and is maintained and remodeled by the actions of a range of histone-like proteins, which associate with the bacterial chromosome.

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