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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. - PowerPoint PPT Presentation
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2 Which of the following reactions is responsible for fixing nitrogen:
A NH4
+ --> NO2
-
B NO2
- --> NO3
-
C NO3
- --> N2
D N2 --> NH3
3 At a neutral pH, which molecule is in the highest concentration
A carbonate
B bicarbonate
C carbonic acid
D carbon dioxide
4 A reaction between an acid and a base will always form water and ________.
A acid
B base
C salt
D carbonate
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
9 Which of the following makes up the smallest percent of global freshwater:
A glaciers
B permafrost
C groundwater
D surface & atmospheric water
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
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
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
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
20 Which of the following is primarily responsible for "fixing" carbon dioxide:
A autotrophs
B chemoautotrophs
C heterotrophs
D biopolymers