RE: https://abend.social/@ebook/116366418126887058
想不到可以滑到這本我超愛的書 機器人沒寫書評我就簡單講一點推薦一下
《能量性死亡》是生化與演化專長的尼克連恩重要研究的回顧，裡面最精彩的部分關於細菌/古菌的遺傳特性構成一種速度戰爭，有別於多細胞生的多樣演化潛能造就其形態與生態的多樣性。天擇對細菌個體和基因的作用，與對多細胞生物的作用產生相反的效果，進而影響生態與演化的運作模式以及人對物種概念的理解。而這個現象便是源自胞器分工的有無，而粒線體作為最早透過內共生形成的胞器，讓缺乏胞器的原始細胞能量自由，擺脫速度戰爭，巨觀生命的複雜性得以存在。然而天擇對內共生的作用造成原始胞器利益與宿主細胞利益必然存在衝突。性是粒線體單係遺傳的副產物，性別是生物解決細胞層面的粒線體不相容的外顯現象。死亡則是熵的一種體現，當遺傳物質與胞器老化，若缺乏主動與被動的凋亡，將造成半殘遺傳物質散佈在族群中。托爾金的中土世界裡，死亡是伊露維塔送給人類的禮物，而現實世界的死亡是多細胞族群健康與續存的必要特徵。
In #evolution we often think about the loss of #genes occurring with transition to an #endosymbiotic lifestyle - this new research on the bacterial phylum Chlamydiae suggests the opposite is also occurring namely gain of genes associated with #metabolism.
New research in Nature Microbiology on
Where do eukaryotes come from?
#Endosymbiotic theory is an evolutionary theory which explains the origin of eukaryotic cells from prokaryotes
* Key organelles of eukaryotes originated as symbiosis between separate single-celled organisms.
* According to this theory, mitochondria and chloroplasts are descendants of formerly free-living bacteria.
https://kaiserscience.wordpress.com/biology-the-living-environment/cells/symbiogenesis/
@edutooters
@science
@scienceteachers
#science #STEM #NGSS #highschoolteachers #scienceteachers #biologyteachers #evolution
f_L
Federico Visi
Professor Mark Osborn
KaiserScience