ch20_lecture - Prokaryotes, Viruses, and Protistans Chapter...

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Prokaryotes, Viruses, and Protistans Chapter 20
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Microorganisms * Single-celled organisms that are too small to be seen without a microscope Bacteria are the smallest living organisms Viruses are smaller but are not alive
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The Prokaryotes * Only two groups Archaebacteria and Eubacteria Arose before the eukaryotes
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Prokaryotic Characteristics * No membrane-bound nucleus Single chromosome Cell wall in most species Prokaryotic fission Metabolic diversity
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Prokaryotic Body Plan * bacterial flagellum pilus capsule cell wall plasma membrane DNA ribosomes in cytoplasm
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Bacterial Shapes * coccus bacillus spirillum
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Archaebacteria * Methanogens Extreme halophiles Extreme thermophiles
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Eubacteria * Includes most familiar bacteria Have fatty acids in plasma membrane Most have cell wall; always includes peptidoglycan Classification based largely on metabolism
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Metabolic Diversity * Photoautotrophs Chemoautotrophs Chemoheterotrophs
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Bacterial Genes * Bacteria have a single chromosome Circular molecule of DNA
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ch20_lecture - Prokaryotes, Viruses, and Protistans Chapter...

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