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Environmental Microbiology and Genetic Engineering

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Question
Answer
Give an example of how scientists have used gene cloning to protect plants from insects   insect toxin genes from B. thuringiensis have been cloned into plants so pland produces the insecticide right on the leaves-when leaves eaten larvae are killed  
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What is BOD?   biochemical oxygen demand: rate at which microbes remove oxygen from water  
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what is the purpose of alum in water purification?   alum forms a gel that microbes and particles stick to as gel settles out and removes them  
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What have we learned from the use of DDT?   pesticides like DDT may harm animals too-need to develop and use pesticides that are quickly broken down by microbes or other means  
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What are lichens?   mutualistic colonies of algae and fungi  
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What digests the cellulose of wood in termites?   protozoa digest cellulose of wood in termites  
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what type of organism produces methane?   archaea  
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Ammonification   breakdown of proteins and nucleic acid by bacteria and fungi to release nitrogen in the form of ammonia  
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Nitrification   oxidation of ammonia to nitrate by the bacteria Nitrosomonas and Nitrobacter  
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Denitrification   occurs when bacteria use nitrate anaerobically and release nitrogen gas  
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Nitrogen fixation   process of bacterial fixation of nitrogen gas into nitrate-2 bacteria that fix nitrogen--Azotobacter and Rhizobium  
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Azotobacter   free living  
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Rhizobium   grow in plant root nodules to fix nitrogen in larger quantities  
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