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Cells and Body Architecture - Cells and Body...

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Cells and Body Architecture (relevant chapters: 3, 9 and pgs 32-34) 1) Prokaryotes versus Eukaryotes a) Prokaryotic i) No membrane-bound nucleus or organelles ii) Small size (1-10 microns) iii) Circular DNA molecule iv) Cell division by binary fission or budding b) Eukaryotic i) Membrane-bound nucleus, organelles ii) Larger (1-10 microns) iii) Homologous chromosomes iv) Cell division by mitosis c) Prokaryotes were first known cells (3.5 bya) d) Eukaryotes evolved from prokaryotes (1.6 bya) e) Endosymbiotic theory- one organism living inside another (1) “endo” – inside (2) “symbiotic” – life together (3) Explains origin of cellular organelles ii) Evidence of theory – (1) Double membranes on chloroplasts and mitochondria (2) Organelles with own DNA – circular molecules
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(3) Size of organelles similar to prokaryotes (4) Endosymbiotic relationships occur in many protists today 2) Levels of Organization a) Protoplasmic i) Unicellular level of organization ii) Organelles carry out functions (1) Ex – protozoans b) Cellular i)
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