Origin of Eukaryotic Cells by Endos

Origin of Eukaryotic Cells by Endosymbiosis
A range of evidence supports a model called endosymbiosis, which proposes that mitochondria and chloroplasts in plants were originally small prokaryotes that began living in larger cells. This theory was first postulated by biologist Lynn Margulis in the 1960s and her original hypothesis proposed that mitochondria were derived from aerobic bacteria, whereas chloroplasts were derived from photosynthetic bacteria or cyanobacteria.
The prokaryotic ancestors of mitochondria and chloroplasts probably gained entry into the host cell as undigested prey or internal parasites that later came to enter into a mutually beneficial relationship with the host. As host and endosymbiont became more interdependent, the two eventually became intergrated into a single organism.
There is supporting evidence for the theory of endosymbiosis. First, The DNA of mitochondria and chloroplasts is similar to that found in bacteria. Also, both mitochondria and chloroplasts are surrounded by two membranes: the inner membrane is like that of a prokaryotic cell membrane whereas the outer membrane is more like the eukaryotic plasma membrane. Thirdly, mitochondria are about the same size as bacteria.

ผลลัพธ์ (แอฟริกา) 1:

oorsprong van eukariotiese selle deur endosimbiose
'n verskeidenheid van bewyse ondersteun 'n model genoem endosimbiose, wat voorstel dat mitochondria en chloroplaste in plante oorspronklik was klein prokariote wat begin leef in groter selle. hierdie teorie is die eerste keer gepostuleer deur bioloog Lynn Margulis in die 1960's en haar oorspronklike hipotese voorgestel dat mitochondria is afgelei van aerobiese bakterieë.terwyl chloroplaste is afgelei van fotosintetiese bakterieë of sianobakterieë.
die prokariotiese voorouers van mitochondria en chloroplaste waarskynlik opgedoen het toegang tot die gasheer sel as onverteerde prooi of interne parasiete wat later gekom het om in 'n wedersyds voordelige verhouding met die gasheer. as gasheer en endosymbiont het meer interafhanklik van mekaar.Die twee het uiteindelik inter gerasperde in 'n enkele organisme.
daar is bewyse vir die teorie van endosimbiose. eerste, die DNA van mitochondria en chloroplaste is soortgelyk aan dié wat in bakterieë. Ook, is beide mitochondria en chloroplaste omring deur twee membrane:.die binneste membraan is soos dié van 'n prokariotiese sel membraan, terwyl die buitenste membraan is meer soos die eukariotiese plasma membraan. Derdens, mitochondria is ongeveer dieselfde grootte as bakterieë
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