| dbo:abstract |
A circular chromosome is a chromosome in bacteria, archaea, mitochondria, and chloroplasts, in the form of a molecule of circular DNA, unlike the linear chromosome of most eukaryotes. Most prokaryote chromosomes contain a circular DNA molecule – there are no free ends to the DNA. Free ends would otherwise create significant challenges to cells with respect to DNA replication and stability. Cells that do contain chromosomes with DNA ends, or telomeres (most eukaryotes), have acquired elaborate mechanisms to overcome these challenges. However, a circular chromosome can provide other challenges for cells. After replication, the two progeny circular chromosomes can sometimes remain interlinked or tangled, and they must be resolved so that each cell inherits one complete copy of the chromosome during cell division. (en) 环形细菌染色体是指呈环形DNA分子的细菌染色体。和大多数真核生物的线性DNA不同，典型的细菌染色体是环形的。 大多数细菌的染色体组由环形的DNA分子构成，这种DNA是没有自由端的。自由端将会给DNA的复制及其稳定性带来巨大困难。含有带DNA端或端粒(大多数真核生物)的染色体的细胞，进化演变出了复杂的机制来克服这些困难。 然而，环形的染色体也给细胞带来了其他的挑战。复制后，两个子代环形染色体有时可能会依然相互连接着或纠缠在一起，必须解决这些问题才能使得在细胞分裂时两个子代细胞均能获得完整的染色体副本。 (zh) |
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| rdfs:comment |
环形细菌染色体是指呈环形DNA分子的细菌染色体。和大多数真核生物的线性DNA不同，典型的细菌染色体是环形的。 大多数细菌的染色体组由环形的DNA分子构成，这种DNA是没有自由端的。自由端将会给DNA的复制及其稳定性带来巨大困难。含有带DNA端或端粒(大多数真核生物)的染色体的细胞，进化演变出了复杂的机制来克服这些困难。 然而，环形的染色体也给细胞带来了其他的挑战。复制后，两个子代环形染色体有时可能会依然相互连接着或纠缠在一起，必须解决这些问题才能使得在细胞分裂时两个子代细胞均能获得完整的染色体副本。 (zh) A circular chromosome is a chromosome in bacteria, archaea, mitochondria, and chloroplasts, in the form of a molecule of circular DNA, unlike the linear chromosome of most eukaryotes. Most prokaryote chromosomes contain a circular DNA molecule – there are no free ends to the DNA. Free ends would otherwise create significant challenges to cells with respect to DNA replication and stability. Cells that do contain chromosomes with DNA ends, or telomeres (most eukaryotes), have acquired elaborate mechanisms to overcome these challenges. However, a circular chromosome can provide other challenges for cells. After replication, the two progeny circular chromosomes can sometimes remain interlinked or tangled, and they must be resolved so that each cell inherits one complete copy of the chromosome (en) |
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Circular chromosome (en) Бактериальные хромосомы (ru) 环形细菌染色体 (zh) |
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