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08. protista short - 1 How and why did the first eukaryotic...

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1 1 How and why did the first eukaryotic cells come about? Flexible exterior – loss of cell wall • Cytoskeleton Internal vesicles, vacuoles, endoplasmic reticulum Nuclear envelope – true nucleus mitochondria, chloroplasts through endosymbiosis Larger size: up to 100 X larger than bacteria 2 What advantage does the cytoskeleton provide? Shape changes F d i ti Food ingestion Internal movement of vesicles Mitosis/ meiosis • ‘muscular’ activities 3 A flexible exterior plus a cytoskeleton allowed the formation of pockets that could become food vesicles 4 A membrane-bound part of the cytoskeleton became a more complex flagellum, and some of the membranes became the nuclear membrane 5 How do flagella of eukaryotes differ from those of the prokaryotes? 9+2 structure 6 What is the evidence for endosymbiosis of mitochondria and chloroplasts?
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