Chapter 27

Chapter 27 - The Origin and Diversification of Eukaryotes...

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Eukaryotes 27.1 How Did the Eukaryotic Cell Arise? Protists o General descriptor o Eukaryote o Not plants o Not animals Extremely diverse LOOK AT TABLE 27.1 5 major groups o Chromalveolta o Plantae o Excavates o Rhizaria o Uniconts Several steps preceded the origin of eukary cells: o Origin of a flexible cell surface o Origin of a cytoskeleton o ROigin of a nuclear envelope o Appearance of digestive vacuoles b/c eukary cell size increased decrease surface area-volume ratio o Acquisition of some organelles by endosymbiosis Cyanobacteria Chloroplasts Uncertainties remain about the origins of eukary cells Eukarya o Fusion of Gram-negative bacterium and an archaean 27.2 What Features Account for Protist Diversity? Microbial eukaryotes have evolved a diversity of lifestyles. Most are aquatic in nature o Marine o Freshwater o Damp soil o Body fluids (human pathogens) Diverse metabolism o Autotrophs o Heterotrophs (ingest/absorb)
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This note was uploaded on 03/23/2011 for the course BIO 1306 taught by Professor Adair,tamarah during the Spring '08 term at Baylor.

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Chapter 27 - The Origin and Diversification of Eukaryotes...

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