ch.27 prokaryotes the origins of metabolic diversity
TRANSCRIPT
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Prokaryotes & the Origins of Metabolic Diversity
Chapter 27
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The Three Domains of Life
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A Comparison of the Three Domains of Life
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Structure & Function:Common Shapes
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Structure & Function:Cell Wall
• Most have cell wall– Maintains shape– Protection
• Made of peptidoglycan
• Gram Stain: Identifies bacteria by cell wall– Gram positive
• simple cell wall
– Gram negative (more dangerous)• More complex
• Less peptidoglycan
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Gram-positive and gram-negative bacteria
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Gram-positive and gram-negative bacteria
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Structure & Function:Motility
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Structure & Function:Pili
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Structure & Function: Endospores
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Structure & Function: Specialized Membranes
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Cyanobacteria
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Contrasting hypotheses for the taxonomic distribution of photosynthesis among prokaryotes
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Nutritional Diversity: Chemoheterotrophs
• Saprobes– Decomposers that absorb nutrients from dead
organic matter
• Parasites– Absorb nutrients from body fluids of living host
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Nutritional Diversity:Nitrogen metabolism
• Nitrogen fixation – – Conversion of N2 to ammonium– Many bacteria can do it
• Other bacteria can convert– Ammonium to nitrate– Nitrate to N2
• Remember the nitrogen cycle?
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Nutritional Diversity:Oxygen
• Obligate aerobes – cannot grow w/out oxygen
• Obligate anaerobes – poisoned by oxygen
• Facultative anaerobes – will use oxygen if it is there, but can live w/out it
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Archaea:Extremophiles
• Methanogens– Produce methane as waste– Obligate anaerobes– Live in swamps and marshes– Used as decomposers in waste water
treatment plants– In guts of animals that digest a lot of cellulose
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• Extreme halophiles
– Salt lovers
– Some require high salinity
– bacteriorhodopsin
Archaea:Extremophiles
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Archaea: Extremophiles
• Extreme Thermophiles– 60-80 degrees Celsius
– Some obtain energy by oxidizing sulfur
– Found in hot springs and deep-sea hydrothermal vents