Chapter 28 Biogeochemical Cycling and Global Climate Change

Chapter 28 Biogeochemical Cycling and Global Climate Change

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

Fill in the Blank Questions

1. ___________ have been defined as communities of organisms and their physical and chemical environments that function as self-regulating units.
   Ecosystems

ASM Objective: 06.01 Microbes are essential for life as we know it and the processes that support life (e.g. in biogeochemical cycles and plant and / or animal microbiota).
ASM Objective: 06.04 Because the true diversity of microbial life is largely unknown, its effects and potential benefits have not been fully explored.
ASM Topic: Module 05 Microbial Systems
Blooms Level: 2. Understand
Learning Outcome: 28.01.01 Explain the term redox potential and how it influences the flux of elements found in specific habitats
Section: 28.01
Topic: Microbial Ecology
Topic: Microbial Roles

True / False Questions

2. Some microbes convert iron to magnetite which is then used as an internal compass to help position the microbe correctly in its environment.
   TRUE

ASM Objective: 06.01 Microbes are essential for life as we know it and the processes that support life (e.g. in biogeochemical cycles and plant and / or animal microbiota).
ASM Objective: 06.04 Because the true diversity of microbial life is largely unknown, its effects and potential benefits have not been fully explored.
ASM Topic: Module 05 Microbial Systems
Blooms Level: 2. Understand
Learning Outcome: 28.01.07 Identify, by metabolic type, microorganisms responsible for dissimilatory nitrate, sulfate, and iron reduction; nitrification; and sulfur and iron oxidation
Section: 28.01
Topic: Microbial Ecology
Topic: Microbial Roles

3. Inorganic phosphorus complexed with cations in the environment is most available to microbes at pH 4 and below because of solubility considerations.
   FALSE

ASM Objective: 06.01 Microbes are essential for life as we know it and the processes that support life (e.g. in biogeochemical cycles and plant and / or animal microbiota).
ASM Objective: 06.04 Because the true diversity of microbial life is largely unknown, its effects and potential benefits have not been fully explored.
ASM Topic: Module 05 Microbial Systems
Blooms Level: 1. Remember
Learning Outcome: 28.01.02 Sketch generalized carbon, nitrogen, phosphorus, sulfur, iron, and manganese cycles
Section: 28.01
Topic: Basic Chemistry

4. The use of sulfate as a terminal electron acceptor by Desulfovibrio is an example of assimilatory sulfate reduction.
   FALSE

ASM Objective: 06.01 Microbes are essential for life as we know it and the processes that support life (e.g. in biogeochemical cycles and plant and / or animal microbiota).
ASM Objective: 06.04 Because the true diversity of microbial life is largely unknown, its effects and potential benefits have not been fully explored.
ASM Topic: Module 05 Microbial Systems
Blooms Level: 2. Understand
Learning Outcome: 28.01.07 Identify, by metabolic type, microorganisms responsible for dissimilatory nitrate, sulfate, and iron reduction; nitrification; and sulfur and iron oxidation
Section: 28.01
Topic: Basic Chemistry
Topic: Microbial Ecology

5. Nutrients are often transformed and cycled by oxidation-reduction reactions that can change the chemical and physical characteristics of the nutrients.
   TRUE

ASM Objective: 06.01 Microbes are essential for life as we know it and the processes that support life (e.g. in biogeochemical cycles and plant and / or animal microbiota).
ASM Objective: 06.04 Because the true diversity of microbial life is largely unknown, its effects and potential benefits have not been fully explored.
ASM Topic: Module 05 Microbial Systems
Blooms Level: 2. Understand
Learning Outcome: 28.01.01 Explain the term redox potential and how it influences the flux of elements found in specific habitats
Section: 28.01
Topic: Basic Chemistry
Topic: Microbial Ecology