Biology 2581B Lecture Notes - Lecture 3: Eukaryote, Lokiarchaeota, Alphaproteobacteria
20 Feb 2017
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Document Summary
A long time ago, a bacterium from the alpha-proteobacteria lineage found its way into the eukaryotic domain through endosymbiosis with a proto-eukaryotic host which gave rise to the mitochondria. 2 distinct organisms; both free-living unicellular & both have a genome. Feeding (i. e. , endocytosis/phagocytosis) is a complex behaviour and cannot be performed by most known bacteria. B hangs out inside a: b starts providing a benefit to a or vice versa, hundreds thousands of years go by, relationship goes stronger, more intimate. Sharing over time a & b develop a relationship. Sharing some kind of product across the membrane; e. g. protein, sugar fat. Some molecule making its way back and forth. Is it symbiotic or parasitic : stealing instead of sharing. B can still survive outside a & they are still 2 distinct organisms. Hundreds thousands of years go by. Within the genome of b, gene x allows b to be free living: e. g.
