chapter 19 revised

chapter 19 revised - Prokaryotes and Viruses Chapter 19...

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Prokaryotes and Viruses Chapter 19
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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 What’s the criteria for being “alive”??
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Definition of Alive? “Fuzzy” definition Growth through metabolism and reproduction Other criteria: Organization movement nutrition respiration excretion growth reproduction response to stimuli
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Prokaryotic Characteristics Etymology No membrane-bound nucleus Single chromosome Cell wall in most species Gram negative Gram positive Prokaryotic fission Metabolic diversity
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Many Shapes and Sizes Coccid ( Staphylococcus aureus ) Rod-shaped ( Bacillus ) Spiral (Spirillum)
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Prokaryotic Body Plan pilus bacterial flagellum cell wall outer capsule plasma membrane cytoplasm, with ribosomes DNA, in nucleoid Role of all of these?
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Plasmids Plasmid Chromosome
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A Comparison
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Metabolic Diversity Photoautotrophs: H2O + CO2 + light → CH2O + O2 Chemoautotrophs CO2 + O2 + 4{H2S} → CH2O + 4{S} + 3{H2O} Photoheterotrophs Chemoheterotrophs??
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Substrate Utilization
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Prokaryotic Fission A parent cell replicates its DNA molecule, which is then separated by a new plasma membrane An orderly deposition of membrane and wall material at the midsection cuts the cell in two – each with a DNA molecule Only bacteria and archaea reproduce by this cell division mechanism
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Prokaryotic Fission
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chapter 19 revised - Prokaryotes and Viruses Chapter 19...

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