Lec10_OriginEukarya - BioG1780 Evolution and Biodiversity...

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BioG1780 Fall 2010 Evolution and Biodiversity Today’s lecturer: Harry Greene Lectures 10: September 17, 2010 1. Endosymbiosis and the rise of eukaryotes. In this lecture we introduce the remaining large and extremely diverse clade of life, the eukaryotes—first focusing on their origin by multiple endosymbiotic events and the implications of those transitions for eukaryotic size and diversity. Then we will characterize five major lineages of living eukaryotes, emphasizing three of them today and returning to the others in blocks of biodiversity lectures later in the semester. 2. What are eukaryotes and how did they originate? Eukaryotes are characterized by multiple internal organelles, most prominently a nucleus (containing the cell’s genetic material) and mitochondria (“powerhouse of the cell”), as well as in the case of photosynthesizers, chloroplasts. Along with various cytoskeletal elements, these attributes make possible a large increase in individual cell size compared to “prokaryotes,” as well as tremendous structural and functional diversification— indeed, a dramatic pattern among basal branches of the tree of life is the remarkable biochemical
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This note was uploaded on 12/20/2011 for the course BIOG 1440 taught by Professor Owens during the Spring '10 term at Cornell.

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Lec10_OriginEukarya - BioG1780 Evolution and Biodiversity...

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