Exam 22: Microbes in Global Elemental Cycles

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In the marine photic zone, the rate of photosynthesis

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Which of the following would decrease the amount of carbon dioxide in the atmosphere?

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Which of the following is NOT an example of a reduced form of carbon in the carbon cycle?

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Which of the following is NOT used as a biosignature?

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Compare and contrast assimilatory and dissimilatory nitrate reduction.

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What types of evidence suggest the past existence of water on Mars?

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Which of the following major biological elements has the highest number of oxidation states?

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Which of these is involved in commercial chemical fertilizer production?

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Wastewater treatment generates which of the following gases in quantities sufficient for recovery as fuel?

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Discuss how human activities have perturbed the nitrogen cycle.

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Which of the following techniques is used to quantify carbon influx and efflux of CO₂ in small, controlled model ecosystems?

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Aeration of an environment containing microbes actively producing methane will

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Corrosion of cement in the sewer pipe shown below is caused by Corrosion of cement in the sewer pipe shown below is caused by

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Which is the most stable form of nitrogen?

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The release of CO₂ by human industry has/is ________ the rate of CO₂ fixation globally.

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If life is found on other planets, it will almost certainly be

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Some bacteria are responsible for degrading concrete. How do they accomplish this?

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The Blood Falls ecosystem is driven by microbes that reduce ________ and others that oxidize ________.

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The sink of an element in the ecosystem

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Compare and contrast carbon cycling in aerobic versus anaerobic terrestrial systems.

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