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BLG 251
Kimberley Gilbride

Multiple choice 1. Main reservoir of staphylococcus aureus is: Human feces Human nasal cavity Human RBC Cattle All of the above 2. Agrobacterium tumegaciens is: a disease producer in humans a bacterium that can be used to introduce DNA into plants – causes tumors in plants by transforming cells on plasmids with tumor forming cells a fungus that is used to produce antibiotics in large amounts a bacterium that replaces good genes with bad genes 3. All of the following are true about releasing untreated sewage into a river except it is a health hazard it increases the BOD it decreases the dissolved oxygen It kills bacteria Influent has higher BOD – more oxygen Removal of solids primary Chemical ppt of phosphorus = tertiary Trickling filter – secondary 4) 1.The BOD of wastewater after the tertiary stage in treatment 2. The BOD of after the primary stage in treatment (BOD of water after tertiary is lower than primary) high BOD is lots of carbon. Is 1 greater then 2 Is 2 greater then 1 BOD after primary is higher than tertiary 1 is exactly or approx equal to 2 1 may stand in more than one of the above relations to 2 5. Biodegradation of lignin is 1- very likely to occur when wooden pilings are sunk into ground below water tables 2- dependent on oxygen availability Only number 2 is true 6. The amount of mercury per gram of tissue in a mercury contaminated area in 1- phytoplanktonic organisms 2- herbivorous organism a) 1 greater then 2 b) 2 greater than 1 c) amounts are the same d) neither 1 nor 2 contain mercury b) is correct – Mercury cycle – some MO are capable of methylating mercury – methyl mercury is much more toxic because it has affinity for lipid components of cells, subjected to biomagnification. Herbivores eat plants – MO that feed on euk (phyto) will have more biomagnified mercury in their tissues. 7. Water ecosystems become eutrophic when there is: A) nutrient enrichment of waters. 8. In streams and rivers, most of the microbial biomass is: C) attached to surfaces. 9. Micr
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