MICR 401 FINAL QUESTIONS AND VERIFIED
ANSWERS
Where does the dissolved diatomic oxygen (O2) in the deep sea come from? - Answers
- The euphotic zone
What are the two most abundant dissolved elements in sea water? (Not including H and
O) - Answers - Na and Cl
Which micronutrient can limit phytoplankton growth in the ocean ocean? - Answers - Fe
(Iron)
What happens to the boiling point of water as pressure increases? - Answers - Boiling
point increases
What is the "Microbial Loop"? - Answers - A term describing the road of marine bacteria
in cycling carbon and nutrients in the ocean
The three domains of life found in the ocean are... - Answers - Archaea, bacteria, and
Eukarya
What is syntrophic association? - Answers - An association in which one species lives
off the products of another species
Which set of terms is in the correct order of size, from smallest (left) to largest? -
Answers - Fentoplankton, Picoplankton, Nanoplankton, Microplankton
The term "neuston" refers to what? - Answers - The upper 1000 um of the oceans
surface
By which mechanism does carbon reach the deep sea? - Answers - Passive export,
active export, the biological pump, and the solubility pump.
Which one of these bacteria is considered the most abundant organisms on earth? -
Answers - Prochlorococcus
Which gas is produced by the breakdown of organic material deep in marine
sediments? - Answers - Methane
In which marine habitat would you expect to find psychrophilic bacteria? - Answers -
Sea ice
, Which device could you use to collect a seawater sample from a depth of 2000-4000m?
- Answers - A Go-Flo
Individuals of this group dominate microbial biomass in seawater below 1000m -
Answers - Archaea
Which organisms in the ocean characteristically contain calcium carbonate? - Answers -
Coccolithophores
Which organisms in the ocean characteristically have a silica frustule? - Answers -
Diatoms
What is the average temperature of water in the deep sea? - Answers - 4 ºC
Which of these is a xenobiotic compound or element that can be used to trace water
masses? - Answers - CFC (Chlorofluorocarbons)
A major characteristic of a habitat in which oligotrophic bacteria grow is: - Answers -
Low nutrient concentration
A major characteristic of a habitat in which thermophilic bacteria grow is: - Answers -
High temperature
The defining characteristic of a habitat in which halophilic bacteria grow is? - Answers -
Presence of salt
Which of these do not host a true gyre? - Answers - Southern Ocean
The 16s rRNA gene encodes the production of? - Answers - A component of bacteria
and archaea ribosomes
Which of these organisms might be a significant source of calcium carbonate to
sediments? - Answers - Emiliania huxleyi
The average (mean) depth of the ocean is said to be: - Answers - Between 3001 and
4000m
The amount of an element in the ocean divided by its rate or removal or addition refers
to: - Answers - The elements residence time in the ocean
In a marine microbiological context, what is DIC? - Answers - Dissolved inorganic
carbon
The term "high latitudes" refers to: - Answers - Polar regions above 60N (arctic) or 60S
(Antarctic)
ANSWERS
Where does the dissolved diatomic oxygen (O2) in the deep sea come from? - Answers
- The euphotic zone
What are the two most abundant dissolved elements in sea water? (Not including H and
O) - Answers - Na and Cl
Which micronutrient can limit phytoplankton growth in the ocean ocean? - Answers - Fe
(Iron)
What happens to the boiling point of water as pressure increases? - Answers - Boiling
point increases
What is the "Microbial Loop"? - Answers - A term describing the road of marine bacteria
in cycling carbon and nutrients in the ocean
The three domains of life found in the ocean are... - Answers - Archaea, bacteria, and
Eukarya
What is syntrophic association? - Answers - An association in which one species lives
off the products of another species
Which set of terms is in the correct order of size, from smallest (left) to largest? -
Answers - Fentoplankton, Picoplankton, Nanoplankton, Microplankton
The term "neuston" refers to what? - Answers - The upper 1000 um of the oceans
surface
By which mechanism does carbon reach the deep sea? - Answers - Passive export,
active export, the biological pump, and the solubility pump.
Which one of these bacteria is considered the most abundant organisms on earth? -
Answers - Prochlorococcus
Which gas is produced by the breakdown of organic material deep in marine
sediments? - Answers - Methane
In which marine habitat would you expect to find psychrophilic bacteria? - Answers -
Sea ice
, Which device could you use to collect a seawater sample from a depth of 2000-4000m?
- Answers - A Go-Flo
Individuals of this group dominate microbial biomass in seawater below 1000m -
Answers - Archaea
Which organisms in the ocean characteristically contain calcium carbonate? - Answers -
Coccolithophores
Which organisms in the ocean characteristically have a silica frustule? - Answers -
Diatoms
What is the average temperature of water in the deep sea? - Answers - 4 ºC
Which of these is a xenobiotic compound or element that can be used to trace water
masses? - Answers - CFC (Chlorofluorocarbons)
A major characteristic of a habitat in which oligotrophic bacteria grow is: - Answers -
Low nutrient concentration
A major characteristic of a habitat in which thermophilic bacteria grow is: - Answers -
High temperature
The defining characteristic of a habitat in which halophilic bacteria grow is? - Answers -
Presence of salt
Which of these do not host a true gyre? - Answers - Southern Ocean
The 16s rRNA gene encodes the production of? - Answers - A component of bacteria
and archaea ribosomes
Which of these organisms might be a significant source of calcium carbonate to
sediments? - Answers - Emiliania huxleyi
The average (mean) depth of the ocean is said to be: - Answers - Between 3001 and
4000m
The amount of an element in the ocean divided by its rate or removal or addition refers
to: - Answers - The elements residence time in the ocean
In a marine microbiological context, what is DIC? - Answers - Dissolved inorganic
carbon
The term "high latitudes" refers to: - Answers - Polar regions above 60N (arctic) or 60S
(Antarctic)
