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Lecture 6 Biology 2

Lecture 6 Biology 2 - Lecture 6-Protists I Chapter 28...

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Lecture 6—Protists I Chapter 28 Eukaryotes Origin of eukaryotes—endosymbiosis Introduction to protists The major groups of protists Eukaryotes What are they? Where did they come from? How did eukaryotes arise from Prokaryotes? Prokaryotes vs. Eukaryotes Prokaryotes Have a cell wall Small size: 0.2-2.0um • Unicellular – But form colonies 3.8 billion years old Eukaryotes Usually no cell wall Larger: 10um – >30 m Uni- or multicellular 2.1 billion years old
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Origin of Eukaryotes-- 2 main theories 1. Archaea-like cells evolved a nucleus, organelle membranes and cytoskeleton 2. Endosymbiosis Symbiosis: a definition Symbiosis : an ecological relationship between two species that live together in direct contact Endosymbiosis Æ fusion into single organism Eukaryotes Endosymbiosis—uniting of several prokaryotic ancestors into a single organism. — a cell or organism that has become part of another organism (=host) Idea originated by a Russian scientist, C. Mereschkovsky, subsequently developed by Lynn Margulis Very controversial at the time (1970’s) Now generally accepted
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