Unit #3 Quiz #3 2013-2014

1. Unit #3 Quiz #3 2013-2014 Grade: «grade» Aquatic Science Subject: «date» Date:

2. 1 Which of the following letters represent the same element/compound in the carbonate buffering system: A B and D B G and H C F and E D C and D

3. 2 All of the following are reasons why bioremediation is being pursued as a viable method of spill clean up, EXCEPT: A It is relatively cheap when compared to other methods B Microbes can easily break down xenobiotics C Non-mobile organisms such as plants can be used to remove contaminants without having to worry about losing track of your organisms. D Over 90% of materials that are considered hazardous can be biodegraded.

4. 3 When considering the carbonate buffering system, all of the following reactions involve hydronium, EXCEPT: A HCO3- --> CO32- B CO32- --> Limestone C H2CO3 --> HCO3- D CO32- --> HCO3-

5. 4 Prochlorococcus are A responsible for 90% of the net primary production B responsible for 50% of the net primary production C responsible for 50% of cellular respiration in the ocean D mostly barophilic

6. 5 The removal of toxins, such as mercury & petroleum oil, by natural or man-made microbes is called: A bioaccumulation B remedioaccumulation C accumuloremediation D bioremediation

7. 6 Which of the following is reason why xenobiotics can be more difficult to break down naturally: A Xenobiotics were designed to increase our fuel efficiency, thus they burn well. B Xenobiotics are known to bioaccumulate in small bodies of water. C Xenobiotics are relatively cheap to clean up. D Xenobiotics have never existed in nature, thus there is no naturally occurring microbe to break it down.

8. 7 Approximately _______% of the planet's water is fresh water. A 2.5 B 10 C 25 D 46

9. 8 Which of the following is a likely result of a massive increase in biochemical oxygen demand of a body of water: A Asphyxiation of higher level organisms such as fish B Asphyxiation of photosynthetic organisms C An increase in higher level organisms such as fish D An increase in higher level organisms such as dolphins and whales

10. 9 Which of the following would be found on a hydrothermal vent: A A psychrophilic bacterium B A psychrotolerant bacterium C A barophilic bacterium D A barotolerant bacterium

11. 10 The majority of water consumed by individuals as well as agriculture in the United States is: A Glacial melt B Groundwater C Permafrost D Desalinated ocean water

12. 11 Which of the following reactions is responsible for fixing nitrogen: A NH4+ --> NO2- B NO2- --> NO3- C NO3- --> N2 D N2 --> NH3

13. 12 All of the following are ways that contaminants can get into a water supply, EXCEPT: A chemicals leaking from an underground waste storage tank B vapors leaking from a surface waste storage tank that condences into groundwater C pesticides running off from an industrial farm and travelling into a nearby river D multiple homes and businesses getting their well water from the same source of groundwater

14. 13 CO32- is A carbonate B bicarbonate C carbonic acid D carbon dioxide

15. 14 All of the following are reasons why bacteria form biofilms EXCEPT: A Bacteria excrete adhesive cells to a surface to prevent the colony from being swept away B Bacterial biofilms allow for colonies to grow large enough to prevent phagocytosis C Bacterial biofilms alter the BOD of a system to prevent asphyxiation of higher level organisms D Bacterial biofilms allow the organisms to remain in favorable niches

16. 15 Which of the following describes alkalinity: A A system’s ability to deal with the addition of a catalyst B A system’s ability to deal with the addition of hydroxide C The sum of all hydronium and hydroxide during the dissociation of water molecules D The sum of equivalents of all species that can neutralize an acid