...It may have originally been a living organism, but as it began to live as a parasite on the cells of other organisms, only the information system remained. The basic information system that all organisms have is genetic DNA (some viruses use RNA as their genetic material), but in organisms that are thought to have retained the appearance of early organisms, such as bacteria and cyanobacteria, the genetic DNA is contained naked within the cells. However, in all animals and plants, the genetic DNA is contained within chromosomes, and a group of these chromosomes is enclosed in the nuclear membrane during interphase of cell division to form what is known as the nucleus. ... *Some of the terminology explanations that mention "gene DNA" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…もともとは生物であったのかもしれないが,他の生物の細胞に〈寄生〉して生きるようになったため,情報のシステムだけが残ってしまったものと考えてもよいだろう。 すべての生物がもつ基本的な情報システムは遺伝子DNA(一部のウイルスはRNAを遺伝物質としている)であるが,細菌,ラン藻のように初期の生物の姿をとどめていると考えられる生物では,遺伝子DNAが裸のまま細胞の中に収まっている。しかし,すべての動物,植物では,遺伝子DNAは染色体の中に収められ,この染色体の集団が細胞分裂の間期には核膜に包まれて,いわゆる核を形成している。… ※「遺伝子 DNA」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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