Lecture 6 Biology 2

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

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Lecture 6—Protists I Chapter 28 •E u k a r y o t e s 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 •L a r g
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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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This note was uploaded on 03/31/2008 for the course EBIO 1220 taught by Professor Demig-addams during the Spring '07 term at Colorado.

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

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