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Homeostasis - metabolism All of these nutritional modes are found among Bacteria! No other kingdom is as diverse in its metabolic pathways. Nutrition ModeEnergy.

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Presentation on theme: "Homeostasis - metabolism All of these nutritional modes are found among Bacteria! No other kingdom is as diverse in its metabolic pathways. Nutrition ModeEnergy."— Presentation transcript:

1 Homeostasis - metabolism All of these nutritional modes are found among Bacteria! No other kingdom is as diverse in its metabolic pathways. Nutrition ModeEnergy SourceCarbon Source PhotoautotrophLightCO 2 ChemoautotrophInorganic chemCO 2 PhotoheterotrophLightOrganic chem ChemoheterotrophOrganic chem

2 Photoautotrophs - photosynthesis Ancient pathway, but not universal Cyanobacteria, Algae, Plants light CO 2 + H 2 O O 2 + CH 2 O chlorophyll Purple-sulfur bacteria light CO 2 + H 2 S S s + CH 2 O chlorophyll

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6 Chemoautotrophs - N metabolism Cyanobacteria, Rhizobium - N 2 fixation H + + ATP + N 2 NH 4 + Nitrosomonas - nitrification CO 2 + NH 4 + NO CH 2 O Pseudomonas - denitrification CH 2 O + NO 3 - N 2 + CO 2 + H 2 O Which of these processes is demonstrating chemoautotrophism?

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8 Photoheterotrophs - strange Rhodospirillum, Rhodomicrobium Light C 2 H 4 O H 2 O O 2 + CH 2 O

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10 Chemoheterotrophs - strange Escherichia coli and many others! CH 2 O + O 2 CO 2 + H 2 O Carbohydrate, etc. provides both the energy source and the carbon source What is another chemoheterotrophic organism? Give the complete Latin binomial!

11 Plant mitochondrion cristae (mesosomes) outer membrane inner membrane

12 Chemoheterotrophy Aerobic Respiration –Glycolysis carbohydrate to pyruvate –Citric Acid Cycle pyruvate to carbon dioxide –Electron Transport Oxidative Phosphorylation CH 2 O + O 2 CO 2 + H 2 O Anaerobic Fermentation –Glycolysis to pyruvate –Fermentive step(s) to return NAD + to glycolysis C 6 H 12 O 6 C 3 H 3 O 3- C 2 H 5 OH + CO 2 C 6 H 12 O 6 C 3 H 3 O 3- H 3 CCHOHCOO- Notice how fermentation can produce gas or acids… These are just a few of the fermentive possibilities!


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