Theory of Endosymbiosis

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The term Endosymbiosis literally means living inside in a mutually beneficial relationship. The Theory of Endosymbiosis was first put forward by Lynn Margulis in 1981, who suggested in her book Symbiosis in Cell Evolution that "the ancestors of eukaryotic cells were symbiotic consortiums of prokaryotic cells with one or more species (endosymbionts) being involved…

Introduction

As they became more interdependent an obligatory symbiosis evolved." (Margulis, Live Chat, n.p.)
The Theory of Endosymbiosis also states that eukaryotic undulipodia originated from spirochete bacteria. The term "undulipodia" is used to describe the eukaryotic motility organelles, flagella and cilia. Undulipodia are composed of microtubules in a specific configuration. Microtubules are comprised of several closely related proteins called tubulins. These structures are far larger and more complex than bacterial flagella, which are made of flagellin proteins. The Endosymbiosis Theory postulates that undulipodia may be derived from bacteria through motility symbioses. This idea is referred to as the exogenous hypothesis. The series of explanations that lead up to the detailed elaboration of the endobiotic origins of the flagellum and cilia point to several lines of circumstantial evidence. The argument emphasizes the biology of the organelles themselves, their distribution, and the occurrence of related and analogous structures.
The Theory of Endosymbiosis significantly stimulated a variety of analytic approaches t ...
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