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单词 symbiogenesis
释义

symbiogenesis /simbaiəu'dʒenisis/

英汉-汉英词典
n. 共生起源
词组 | 习惯用语
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  • pathogenesis n. 发病机理
  • subconscious adj. 下意识的;潜意识的
  • symbiosis n. (通常互利的)共生(现象) (人与人之间的)互利关系
  • semiconscious adj. 半意识的

网络短语:
Symbiogenesis 共生发源; 共生起源;
英语百科

Symbiogenesis

Endosymbiotic theory

One model for the origin of mitochondria and plastids.
The human mitochondrial genome retained genes encoding  2 rRNAs, 22 tRNAs, and 13 redox proteins

Symbiogenesis, or endosymbiotic theory, is an evolutionary theory that explains the origin of eukaryotic cells from prokaryotes. It states that several key organelles of eukaryotes originated as a symbiosis between separate single-celled organisms. According to this theory, mitochondria, plastids (for example chloroplasts), and possibly other organelles representing formerly free-living bacteria (prokaryotes) were taken inside another cell as an endosymbiont around 1.5 billion years ago. Molecular and biochemical evidence suggest that mitochondria developed from proteobacteria (in particular, Rickettsiales, the SAR11 clade, or close relatives) and chloroplasts from cyanobacteria (in particular, nitrogen-fixing filamentous cyanobacteria).

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