Microbiology: An Introduction
12th Edition
ISBN: 9780321929150
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: PEARSON
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Chapter 27, Problem 3R
In the sulfur cycle, microbes degrade organic sulfur compounds, such as (a) __, to release H2S, which can be oxidized by Thiobacillus to (b) __. This ion can be assimilated into amino acids by (c) __ or reduced by Desulfovibrio to (d) __. H2S is used by photoautotrophic bacteria as an electron donor to synthesize (e) __. The sulfur-containing by-product of this
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Green sulfur bacteria are able to generate which of the following inorganic product molecules during anoxygenic photosynthesis?
elemental sulfur
glucose
C6H12O6
oxygen
hydrogen sulfide
Green sulfur bacteria are able to generate which of the following inorganic product molecules during anoxygenic photosynthesis?
elemental sulfur
glucose
C6H12O6
oxygen
hydrogen sulfide
The photosynthetic process used by the green sulfur bacteria, under anaerobic conditions, is best represented by which of the following balanced equations? cell bio
6CO2 + 12H2S C6H12O6 + 6S2 + 6H2O
C6H12O6 + C6H12O6 C12H22O11 + H2O
6CO2 + 12H2O C6H12O6 + 6O2 + 6H2O
C12H22O11 + H2O C6H12O6 + C6H12O6
C6H12O6 + 6O2 + 6H2O 6CO2 + 12H2O
If two cultures of a facultative anaerobe were grown under identical conditions except that one was exposed to oxygen and the other was completely deprived of oxygen, what differences would you expect to see between the two cultures? (What metabolic pathway would be occurring in each? Why?)
Chapter 27 Solutions
Microbiology: An Introduction
Ch. 27 - The koala is a leaf-eating animal. What can you...Ch. 27 - Give one possible explanation of why Penicillium...Ch. 27 - In the sulfur cycle, microbes degrade organic...Ch. 27 - Why is the phosphorus cycle important?Ch. 27 - DRAW IT 5. Identify where the following processes...Ch. 27 - Prob. 6RCh. 27 - Outline the treatment process for drinking water.Ch. 27 - Prob. 8RCh. 27 - Bioremediation refers to the use of living...Ch. 27 - NAME IT 10. These nitrogen-fixing prokaryotes...
Ch. 27 - Activated sludge system a. the process takes place...Ch. 27 - Prob. 2MCQCh. 27 - Nitrogen fixation a. the process takes place under...Ch. 27 - Prob. 4MCQCh. 27 - The water used to prepare intravenous solutions in...Ch. 27 - CO2+H2SLightLightC6H12O6+S0 a. aerobic respiration...Ch. 27 - Prob. 7MCQCh. 27 - CO2+8H++8eCH4+2H2O a. aerobic respiration b....Ch. 27 - Prob. 9MCQCh. 27 - Coliforms are used as indicator organisms of...Ch. 27 - Prob. 1ACh. 27 - Explain the effect of dumping untreated sewage...Ch. 27 - Flooding after two weeks of heavy rainfall in...Ch. 27 - The bioremediation process shown in the photograph...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- 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 sulfidesarrow_forwardWrite 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!arrow_forwardThe photosynthetic process used by the green sulfur bacteria, under anaerobic conditions, is best represented by which of the following balanced equations? 6CO2 + 12H2O C6H12O6 + 6O2 + 6H2O 6CO2 + 12H2S C6H12O6 + 6S2 + 6H2O C12H22O11 + H2O C6H12O6 + C6H12O6 C6H12O6 + C6H12O6 C12H22O11 + H2O C6H12O6 + 6O2 + 6H2O 6CO2 + 12H2Oarrow_forward
- What is the primary difference between lactic acid fermentation and alcoholic fermentation? lactic acid produced CO2, whereas alcoholic fermentation does not alcoholic fermentation produces O2, whereas lactic acid does not alcoholic fermentation produces CO2, whereas lactic acid does not alcoholic fermentation is an aerobic process, whereas lactic acid fermentation is an anaerobic processarrow_forwardCan you show in a diagram how sulfur is cycled (Sulfur cycle) in a water column (Winogradsky column) starting from sulfate? Please indicate the name of the important metabolic pathways and physiological groups involved.arrow_forwardI need to find two gram positive and two gram negative pathogenic bacteria that may be classified as being facultative anaerobes. What tissues or organs do these bacteria target in the human body? Why is it to their advantage to be able to use either aerobic respiration or anaerobic respiration/fermentation?arrow_forward
- Select the pathways ahead that are exclusively performed by bacteria: -Disproportionation of thiosulfate -Metanogenesis -Photossyntesis -Desulfurylation -Methanotrophy -Ammonification -Nitrification -Denitrification -Methylotrphy -Assimilatory sulfate reduction -Dissimilatory sulfate reduction -Ammonium asimilation -Cemolithotrophic CO2 reduction -ANAMOX -Respiration -Nitrate assimilation -Dissimilatory Nitrate Reduction to Ammonium -Atmospheric Nitrogen fixation -Elemental sulfur aerobic oxidationarrow_forwardName two enzymes that are present in obligate aerobes but lacking in obligate anaerobes. What is the function of each enzyme?arrow_forwardEscherichia coli is a facultative anaerobe that ferments sugars. In the absence of oxygen, it does not use its electron transport chain but can still use an F1F0-ATPase. In the presence of oxygen, it respires oxygen through the electron transport chain. In the presence of oxygen, how does E.coli obtain its three energy intermediates?arrow_forward
- Which of the following pathways is used to fix inorganic carbon into organic form (like methane), by the anaerobic, chemoautotrophic archaeobacterium Methanococcus jannaschii? the reductive acetyl-CoA pathway the Hill reaction the Krebs cycle the Calvin cycle oxygenic photosynthesisarrow_forwardWhich of the following sequences of electron carriers could represent a workable bacterial electron transport chain? a. cytochromes, followed by an iron-sulfur protein, and quinones. b. quinones, cytochromes, iron-sulfur proteins, and a flavoprotein. c. a flavoprotein, followed by an iron-sulfur protein, quinones, and cytochromes. d. cytochromes, followed by quinones and a flavoprotein.arrow_forwardWhich of the following sequences of electron carriers could represent a workable bacterial electron transport chain? a. cytochromes, followed by an iron-sulfur protein, and quinones. b. quinones, cytochromes, iron-sulfur proteins, and a flavoprotein. c. a flavoprotein, followed by an iron-sulfur protein, quinones, and cytochromes. d. cytochromes, followed by quinones and a flavoprotein. The Tricarboxylic Acid Pathway (Kreb’s Cycle) supplies most of the precursors (carbon skeletons) of the amino acids used in protein synthesis. The rest are derived from intermediates of a. Glycolysis. b. the Pentose Phosphate Pathway. c. the Glyoxylate Pathway. d. Glycolysis and the Pentose Phosphate Pathway. Fermentation of pyruvate to ethanol supports glycolysis by a. reducing excess pyruvate. b. oxidizing excess glucose-6-phosphate. c. oxidizing reduced NAD. d. oxidizing excess ethanol.arrow_forward
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