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Unit #3 Quiz #2

Unit #3 Quiz #2. Grade:. «grade». Aquatic Science. Subject:. «date». Date:. 1. Microbes account for about ________% of all the biological mass on Earth. A. 98%. B. 75%. C. 50%. D. 22%. 2. Which of the following reactions is responsible for fixing nitrogen:. A.

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Unit #3 Quiz #2

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  1. Unit #3 Quiz #2 Grade: «grade» Aquatic Science Subject: «date» Date:

  2. 1 Microbes account for about ________% of all the biological mass on Earth. A 98% B 75% C 50% D 22%

  3. 2 Which of the following reactions is responsible for fixing nitrogen: A NH4+ --> NO2- B NO2- --> NO3- C NO3- --> N2 D N2 --> NH3

  4. 3 At a neutral pH, which molecule is in the highest concentration A carbonate B bicarbonate C carbonic acid D carbon dioxide

  5. 4 A reaction between an acid and a base will always form water and ________. A acid B base C salt D carbonate

  6. 5 HCO3- is A carbonate B bicarbonate C carbonic acid D carbon dioxide

  7. 6 Which of the following is NOT a protist: A Hydra B Amoeba C Euglena D Paramecium

  8. 7 H2CO3 is A carbonate B bicarbonate C carbonic acid D carbon dioxide

  9. 8 Which of the following is an example of molecular dissociation: A H+ + OH- --> H2O B H2O --> H+ OH- C Fe + CuSO4 --> Cu + FeSO4 D AgNO3 + HCl --> HNO3 + AgCl

  10. 9 Which of the following makes up the smallest percent of global freshwater: A glaciers B permafrost C groundwater D surface & atmospheric water

  11. 10 The measure of water's ability to buffer against addition of an acid, i.e., ability to resist change of pH upon addition of an acid defines A salinity B alkalinity C hydrophilic D carbonate

  12. 11 What percentage of all of the planet's water is fresh water? A 98% B 70% C 30% D 2.5%

  13. 12 Which of the following is considered an indicator species: A daphnia B hydra C diatoms D amoebas

  14. 13 Which of the following describes a microbe's prime niche A An environment that has a high amount of competition for resources B An environment that has enough nutrients for the microbe to survive C An environment that has enough nutrients for the microbe to thrive D An environment that lacks any usable nutrients and is inhospitable to microbes

  15. 14 The following image demonstrates: A high species richness but low abundance B high species abundance but low richness C high species richness and high species abundance D low species richness and low species abundance

  16. 15 Which of the following describes the behavior of a hydrophobic substance: A A solution that easily mixes into salt water B A salt sample is added to fresh water & it quickly dissolves C A solution is added to a water sample and the solution floats on top of the water D A large sample of sugar is added to fresh water, but does not dissolve until heat is applied to the mixture

  17. 16 Hydrophilic means A "water changing" B "water hating" C "water fearing" D "water loving"

  18. 17 CO32- is A carbonate B bicarbonate C carbonic acid D carbon dioxide

  19. 18 Which element is always associated with organic compounds: A salt B carbon C oxygen D hydroxide

  20. 19 Which element is always associated with organic compounds: A salt B carbon C oxygen D hydroxide

  21. 20 Which of the following is primarily responsible for "fixing" carbon dioxide: A autotrophs B chemoautotrophs C heterotrophs D biopolymers

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