Sept 11-08 - Eukaryotes, Protists, & Diversity Lecture

Sept 11-08 - Eukaryotes, Protists, & Diversity...

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Josh Bovard Biology 111 – Thursday, September 11 th , 2008 Professor Graham Bell E UKARYOTES , P ROTISTS IVERSITY Eukaryotes : ~1-2 billion years old Almost all eukaryotes contain mitochondria and/or chlorophyll Mitochondria probably evolved from endosymbiosis Because eukaryotes have a cytoskeleton and the ability to change shape, they are able to develop motility inside and outside of the cell Can also perform phagocytosis Bacteria cannot take up this way of life because of their cell wall to eat other organisms, the bacteria must go into the cell and work outward; they are unable to engulf and digest Endosymbiosis is a process where one cell ‘swallows’ another cell (specifically prokaryote) and ends up living together instead of digesting it (form partnership) this is the process that created mitochondria and chloroplasts evidence is shown in the double-cell membrane around mitochondria genes in mitochondria that match bacterial genes target sequence DNA of nuclear genes targeted for the chloroplast match a protein on the membrane of bacteria reproduce by binary fission, not by creation from nuclear proteins with the mitochondria, eukaryotes would die Protists A eukaryote, but not an animal, plant or fungi Bigger than bacteria but still very small, making the diversity very poorly understood Most protists are probably living in the sea, barely larger than bacteria
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This note was uploaded on 04/10/2010 for the course BIOL 112 taught by Professor Lasko during the Spring '08 term at McGill.

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Sept 11-08 - Eukaryotes, Protists, & Diversity...

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