Biol 1301 unt 5 dscs Evolution of eukaryotic cells via endosymbiosis PDF

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Eolution of eakaryotic cells via endosymbiosis unit 5 discussion. introduction to biology 1301. the year 2020/2021...

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Evolution of eukaryotic cells via endosymbiosis Eukaryotic cells may have evolved from prokaryotic cells according to endosymbiosis theory. Endosymbiosis theory states that eukaryotes may have been a product of one cell engulfing another, one living within the other. And evolving over time until the separate cells were no longer recognizable (Lumen, n. d.). There is compelling evidence that mitochondria and chloroplast were once primitive bacterial cells. Hypothesized steps for the evolution of eukaryotic cells Prokaryotic cell membrane folded into cytoplasm, the nuclear membrane, endoplasmic retinaculum and Golgi body become independent of external membrane and then there is an engulfment of eukaryotes but the prokaryotes keeps living, surviving inside the eukaryote and they become dependence of each other. Ancestral eukaryote engulfed aerobic bacteria which evolved into mitochondria producing energy for the cell and those aerobes were no longer able to survive on their own. Secondly endosymbiotic event engulfed cyanobacteria, which is the photosynthetic bacteria that evolve into chloroplast and also cyanobacteria were no longer able to survive on their own. Chloroplast only found in plant cells but it’s not found in all eukaryotic cells (Lumen, n. d.). There is evidence that clearly supports this theory some of the evidence explains that mitochondria and chloroplast have DNA that differs from the one found in nucleus of eukaryotic cells but it is identical to bacteria’s circular DNA. Mitochondria and chloroplast have plasma membranes similar to bacterial membranes surrounding them (Lumen, n. d.). There are a lot of

evidences that support endosymbiosis theory. And my position is of the positive view that endosymbiosis theory is correct.

Reference Lumen (n. d.). Eukaryotic origin. Lumen learning. Retrieved from https://courses.lumenlearning.com/bccc-bio101/chapter/eukaryotic-origins/ Openstax College (2013). Biology. Rice University retrieved from http://cnx.org/contents/[email protected]:1...