In The Origin Of The Eukaryotes, Endosymbiosis (2023)

1. Endosymbiotic theories for eukaryote origin - PMC - NCBI

  • May 6, 2015 · For over 100 years, endosymbiotic theories have figured in thoughts about the differences between prokaryotic and eukaryotic cells.

  • For over 100 years, endosymbiotic theories have figured in thoughts about the differences between prokaryotic and eukaryotic cells. More than 20 different versions of endosymbiotic theory have been presented in the literature to explain the origin of ...

2. Endosymbiotic selective pressure at the origin of eukaryotic cell biology

  • Nov 10, 2022 · Inspecting eukaryotic traits from the perspective of the endosymbiont uncovers that eukaryotic cell biology can be explained as having evolved ...

  • All the characteristic traits of the eukaryotic cell, the basic unit of all macroscopic life, commenced to originate in a prokaryote as means to serve an endosymbiont today known as mitochondria.

3. Eukaryotes and their Origins | Organismal Biology

  • Like mitochondria, chloroplasts appear to have an endosymbiotic origin and are derived from cyanobacteria that lived inside the cells of an ancestral, aerobic, ...

  • Microfossil evidence suggests that eukaryotes evolved sometime between 1.6 and 2.2 billion years ago during the Proterozoic. Prior to the origin of eukaryotes, all life on Earth was prokaryotic (lacking nucleus or other membrane-bound organelles). The leading hypothesis for the origin of eukaryotes, called the endosymbiotic theory, is that eukaryotes arose as a result of a fusion of Archaean cells with bacteria, where an ancient Archaean engulfed (but did not eat) an ancient, aerobic bacterial cell. The engulfed (endosymbiosed) bacterial cell remained within the archaean cell in what may have been a mutualistic relationship: the engulfed bacterium allowed the host archean cell to use oxygen to release energy stored in nutrients, and the host cell protected the bacterial cell from predators. Over many generations, a symbiotic relationship developed between the two organisms so completely that neither could survive on its own. The descendants of this ancient engulfed cell are present in all eukaryotic cells today as mitochondria.

4. Evidence for endosymbiosis - Understanding Evolution

  • ... endosymbiosis is the best explanation for the evolution of the eukaryotic cell. ... Finding our roots · How important is endosymbiosis? Credits. Footer. Connect.

  • Biologist Lynn Margulis first made the case for endosymbiosis in the 1960s, but for many years other biologists were skeptical. Although Jeon watched his amoebae become infected with the x-bacteria and then evolve to depend upon them, no one was around over a billion years ago to observe the events of endosymbiosis. Why should we

5. Origin of Mitochondria | Learn Science at Scitable - Nature

  • But eukaryotes also possess genes that they inherited vertically from the endosymbiont - for example, mitochondrially encoded genes for mitochondrial ribosomes.

  • Mitochondria are often introduced as the ATP-producing “powerhouses” of eukaryotic (nucleus-bearing) cells, but they fulfill essential roles in a number of other cell processes, including biosyntheses, programmed cell death, and the assembly of iron-sulfur clusters, to name just a few. Mitochondria are always surrounded by two membranes, and most mitochondria, but not all, contain their own DNA, which is an evolutionarily reduced bacterial chromosome. Since the early 1900s, mitochondria were suspected to have arisen through an endosymbiosis — one cell coming to live within another. By the 1970s, the existence of DNA in mitochondria and the overall similarity between mitochondrial ATP-producing biochemistry and that in free-living bacteria provided strong evidence in favor of that view. There is no longer any doubt that mitochondria arose through endosymbiosis, but there is currently a plurality of ideas about the kind of bacterium the ancestral mitochondrial endosymbiont was, the nature of the host that acquired the endosymbiont, and the nature of the initial symbiotic interactions that associated the host and the endosymbiont in their fateful encounter.

6. The Origin and Evolution of Eukaryotes

  • Endosymbiosis is universally accepted to have played a major role in the evolution of eukaryotes (most obviously, in the origin of cellular organelles such as ...

  • A new type of review journal, featuring comprehensive collections of expert review articles on important topics in the molecular life sciences

7. The Origin of Eukaryotes: Where Science and Pop Culture Collide

  • May 4, 2018 · Endosymbiont theory. Source. There have been many iterations of endosymbiotic theory over the past century, but the theory hasn't remained ...

  • How did eukaryotic life evolve? Here, one of the most puzzling questions in evolutionary history meets Star Wars and the Marvel Universe.

8. 23.1 Eukaryotic Origins - Biology 2e | OpenStax

  • Mar 28, 2018 · Describe what scientists know about the origins of eukaryotes based on the last common ancestor; Explain the endosymbiotic theory. Organisms are ...

  • Data from these fossils, as well as from the study of living genomes, have led comparative biologists to conclude that living eukaryotes are all descend...

9. Endosymbiotic theory - Definition and Examples - Biology Online Dictionary

  • Jun 30, 2023 · ... origin of organelles in eukaryotic cells is based on early endosymbiosis ... endosymbiosis between prokaryotic endosymbionts and eukaryotic host ...

  • Endosymbiotic Theory explained. Know its definition and history. Take the Endosymbiotic theory Biology Quiz!

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