review questions9 - 1 Why are endospores important in home...

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1. Why are endospores important in home canning? Give an example of a bacterium that forms endospores. 1b. T or F. Bacteria have been resurrected from 250 million yr old spores locked in amber 2. How do Aracheabacteria differ from Eubacteria? 3. Which molecular procedure has revolutionized the classification of bacteria? 4. Can bacteria survive temperatures above the boiling point? pH's equal to pure sulphuric acid? saturated salt solutions? 5. Where are methanogens commonly found? What happens to them in air? Not covered 6. What is the terminal electron acceptor for methanogens in their energy harvesting reactions? 7. Where are methanogens found in humans? Cattle? 8. What happens to methane liberated in ocean sediments of deep water (cold and high pressure)? 9. Which Eubacteria was responsible for raising the level of oxygen on this planet to levels that supported aerobic lifeforms? cyanobacteria 10. What are stromatolites? these are calcium carbonate contretions that are formed by certain cyanobacteria. These algae secret calcium carbonate. They are easily spoted as the earliest lifeforms on the planet. There is very old bacteria on the visitor center in Harvey. 11. Besides producing oxygen, why are cyanobacteria important? (hints: nasty byproducts, providing a limiting nutrient, symbiotic relationships with other organisms) some species produce very nasty neuro toxins. Fatality in WI. Seventeen year old ate to much cyanoacteria. 12. What is nitrogen fixation? Which organisms do it? Why are nodule- forming plants particularly good at it? cyanobacteria fix nitrogen and then organisms count they in for mutualism. Nitrogen fixation is the conversion of nitrogen to ammonia, bacteria are the only organism hat can do it besides humans. Plants can eat ammonia, and so can bacteria. That creates new nitrogen for the bio sphere. Also another group besides cyanobactiera is rhizobiun. They live insides gall like nodules in legumnes that takea lot of energy to fix nitrogen. 13. Does photosynthesis always result in oxygen production? it does with cyanobacteria and for diatoms…but its not the only way to carry on photosynthesis. Many bacteria do photosynthesize but done get o2 from it. They get o2 by splitting water. They also fill the hole in chlorophyll by splitting hydrogen sulkfide 14. Do all life-processes begin with energy from the sun? no bacteria can live under rock. We call them chemoautotrophes= lithotrophs. They harvest there own energy from oxidizeing inorganic compounds . example is sulfur oxidizeing bacteria. They get engery out of that. 15000 ft in the bottom of the ocean. Also showed us the iron oxidizing bacteria. 15. Nearly all carbon fixed by plants is eventually broken down and respired by ___ bacteria and fungi ______ as ____ carbon dioxide ______. 16. Most the carbon liberated in Q 19, is released into the atmosphere and fixed by plants again and again. A small %, roughly one part in ___ ten thousand __, is not recycled but becomes locked up in stable forms, such as _____ peat or coat ____ in bogs.
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