Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Chapter 30.2, Problem 1MI
How is sulfur cycled between the anoxygenic photosynthetic microbes belonging to the genera Chlorobium and Chromatium, and anaerobic heterotrophic Desulfovibrio spp.?
Figure 30.5 The Winogradsky Column. Microorganisms and nutrients interact over a vertical gradient in these microcosms. Fermentation products and sulfide migrate up from the reduced lower zone, and oxygen penetrates from the surface. This creates conditions similar to those in a lake or salt marsh with nutrient-rich sediments. Light simulates the penetration of sunlight into the anoxic lower region, which stimulates photosynthetic microorganism growth.
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Write the complete redox reactions for the following microbial metabolisms. Give an example of a type of environment where such bacteria may thrive (will there be plentiful O2? Organics-rich sediment? mineral-bearing rock formations etc?)
Oxidation of glucose (C6H12O6) by sulfate (H2SO4) reducers (redox products are CO2 and H2S).
Oxidation of ferrous hydroxide (Fe(OH)2) by iron-oxidizing bacteria in oxygen (O2)-rich environment. Redox products are Fe(OH)3 and H2
Please write all redox reactions correctly and explain! Thanks!
Which of these are valid sulfur cycle pathways?
Sedimentation of thiosulfates
Anoxic emission of sulfides
Atmospheric S6 deposition O
Elemental sulfur oxidation by Thiobacillus
Mineralization of organic and inorganic sulfates O
co2 photochemolithotrophic fixation by anaerobic bacteria
Mineral formation from reduced sulfides
Which of the following statements is false?
A.
Sulfur-oxidizing bacteria may form hydrogen sulfide (H2S) as a product of the oxidation.
B.
Dissimilatory reduction of metals such as Fe3+ to Fe2+ represents anaerobic respiration.
C.
The nitrification reactions carried out by certain bacteria would be considered lithotrophy.
D.
Denitrification reactions would be considered anaerobic respiration.
Chapter 30 Solutions
Prescott's Microbiology
Ch. 30.1 - Prob. 1MICh. 30.1 - What factors influence oxygen solubility? How is...Ch. 30.1 - Describe the buffering system that regulates the...Ch. 30.1 - Prob. 3CCCh. 30.1 - What features of a thermocline make it similar to...Ch. 30.2 - How is sulfur cycled between the anoxygenic...Ch. 30.2 - Prob. 1.1CCCh. 30.2 - Prob. 1.2CCCh. 30.2 - How do heterotrophic microbes contribute to the...Ch. 30.2 - Prob. 3MI
Ch. 30.2 - What is marine snow? Why is it important in CO2...Ch. 30.2 - Prob. 2.2CCCh. 30.2 - Prob. 2.3CCCh. 30.2 - Prob. 2.4CCCh. 30.2 - Prob. 2.5CCCh. 30.2 - Explain what is meant by upside-down microbial...Ch. 30.2 - Prob. 2.7CCCh. 30.3 - Figure 30.15 Nutrient Cycling in Antarctic Lakes...Ch. 30.3 - How does the contribution of benthic autotrophs...Ch. 30.3 - Why does water turbulence play only a minor role...Ch. 30.3 - Why is mixotrophy suited for survival in Antarctic...Ch. 30.3 - What is an oxygen sag curve? What changes in a...Ch. 30.3 - What are point and nonpoint source pollution? Can...Ch. 30.3 - Prob. 4CCCh. 30.3 - Prob. 5CCCh. 30.3 - Why do cyanobacteria often dominate waters that...Ch. 30 - Prob. 1RCCh. 30 - Prob. 2RCCh. 30 - Prob. 3RCCh. 30 - Prob. 4RCCh. 30 - Prob. 5RCCh. 30 - Prob. 6RCCh. 30 - Prob. 7RCCh. 30 - Prob. 8RCCh. 30 - The unicellular cyanobacterium Prochlorococcus sp....Ch. 30 - Prob. 2ALCh. 30 - It is well known that bacterivory (the consumption...Ch. 30 - Prob. 4AL
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