Brock Biology of Microorganisms (15th Edition)
15th Edition
ISBN: 9780134261928
Author: Michael T. Madigan, Kelly S. Bender, Daniel H. Buckley, W. Matthew Sattley, David A. Stahl
Publisher: PEARSON
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Textbook Question
Chapter 14.8, Problem 2MQ
Why is reverse electron flow unnecessary in H2 bacteria that contain two hydrogenases?
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What is reverse electron transport and why is itnecessary in purple sulfur bacteria?
What is reverse electron flow and why is it necessary? Whichphototrophs need to use reverse electron flow?
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
Chapter 14 Solutions
Brock Biology of Microorganisms (15th Edition)
Ch. 14.1 - What is the fundamental difference between an...Ch. 14.1 - What is the purpose of chlorophyll and...Ch. 14.1 - Why can phototrophic green bacteria grow at light...Ch. 14.1 - What are the functions of light-harvesting and...Ch. 14.2 - In which phototrophs are carotenoids found?...Ch. 14.2 - How does the structure of a phycobilin compare...Ch. 14.2 - Phycocyanin is blue-green. What color of light...Ch. 14.2 - What accessory pigments are present in...Ch. 14.3 - What parallels exist in the processes of...Ch. 14.3 - What is reverse electron flow and why is it...
Ch. 14.3 - What is the difference between cyclic and...Ch. 14.3 - What is reverse electron transport and why is it...Ch. 14.4 - Differentiate between cyclic and noncyclic...Ch. 14.4 - What is the key role of light energy in the...Ch. 14.4 - What evidence is there that anoxygenic and...Ch. 14.4 - Prob. 1CRCh. 14.5 - Prob. 1MQCh. 14.5 - How much NADPH and ATP is required to make one...Ch. 14.5 - Contrast autotrophy in the following phototrophs:...Ch. 14.5 - QWhat is a carboxysome, and what is its role in...Ch. 14.6 - Prob. 1MQCh. 14.6 - What is FeMo-co and what does it do?Ch. 14.6 - How is acetylene useful in studies of nitrogen...Ch. 14.6 - How might the ability to fix nitrogen help a...Ch. 14.7 - In a coupled reaction, how can you tell the...Ch. 14.7 - How does aerobic respiration differ from anaerobic...Ch. 14.7 - Describe the major differences between...Ch. 14.7 - Prob. 1CRCh. 14.8 - What enzyme is required for hydrogen bacteria to...Ch. 14.8 - Why is reverse electron flow unnecessary in H2...Ch. 14.8 - QWhich inorganic electron donors are used by the...Ch. 14.9 - Prob. 1MQCh. 14.9 - In terms of intermediates, how does the Sox system...Ch. 14.9 - Prob. 1CRCh. 14.10 - Prob. 1MQCh. 14.10 - What is the function of rusticyanin and where is...Ch. 14.10 - How can Fe2+ be oxidized under anoxic conditions?Ch. 14.10 - Prob. 1CRCh. 14.11 - Prob. 1MQCh. 14.11 - Prob. 2MQCh. 14.11 - Prob. 1CRCh. 14.12 - What are the electron donor and acceptor in the...Ch. 14.12 - What does electron transport in anammox bacteria...Ch. 14.12 - Compare CO2 fixation in anammox bacteria and...Ch. 14.12 - Prob. 1CRCh. 14.13 - For Escherichia coli, why is more energy released...Ch. 14.13 - How do the products of NO3 reduction differ...Ch. 14.13 - Where is the dissimilative nitrate reductase found...Ch. 14.13 - Prob. 1CRCh. 14.14 - How is SO42 converted to SO32 during dissimilative...Ch. 14.14 - Contrast the growth of Desulfovibrio on H2 versus...Ch. 14.14 - Give an example of sulfur disproportionation.Ch. 14.14 - Prob. 1CRCh. 14.15 - Prob. 1MQCh. 14.15 - What is reductive dechlorination and why is it...Ch. 14.15 - How does anaerobic glucose catabolism differ in...Ch. 14.15 - Compare and contrast ferric iron reduction with...Ch. 14.16 - What is the purpose of CO dehydrogenase?Ch. 14.16 - If acetogens conserve energy using the Rnf...Ch. 14.16 - What is electron bifurcation and what role does it...Ch. 14.16 - Compare and contrast acetogens with methanogens in...Ch. 14.17 - Which coenzymes function as C1 carriers in...Ch. 14.17 - In methanogens growing on H2 + CO2, how is carbon...Ch. 14.17 - How is ATP made in methanogenesis when the...Ch. 14.17 - What are the major differences in the conservation...Ch. 14.18 - When using CH4 as electron donor, why is...Ch. 14.18 - In which two ways does the ribulose monophosphate...Ch. 14.18 - What is unique about methanotrophy in...Ch. 14.18 - Prob. 1CRCh. 14.19 - Why is H2 produced during many types of...Ch. 14.19 - Why is acetate formation in fermentation...Ch. 14.19 - Define the term substrate-level phosphorylation:...Ch. 14.20 - How can homo- and heterofermentative metabolism be...Ch. 14.20 - Butanediol production leads to greater ethanol...Ch. 14.20 - QWhat are the major fermentation products of...Ch. 14.21 - Compare the mechanisms for energy conservation in...Ch. 14.21 - What type of substrates are fermented by...Ch. 14.21 - What are the substrates for the Clostridium...Ch. 14.21 - Prob. 1CRCh. 14.22 - Why does Propionigenium modestum require sodium...Ch. 14.22 - Of what benefit is the organism Oxalobacter to...Ch. 14.22 - Prob. 3MQCh. 14.22 - Give an example of a fermentation that does not...Ch. 14.23 - Give an example of interspecies H2 transfer. Why...Ch. 14.23 - Why can a pure culture of Syntrophomonas grow on...Ch. 14.23 - Why is syntrophy also called interspecies H2...Ch. 14.24 - How do monooxygenases differ in function from...Ch. 14.24 - What is the final product of catabolism of a...Ch. 14.24 - Prob. 3MQCh. 14.24 - How do monooxygenases differ from dioxygenases in...Ch. 14.25 - What is the benzoyl-CoA pathway, and how might it...Ch. 14.25 - How is hexane oxygenated during anoxic catabolism?Ch. 14.25 - Prob. 1CRCh. 14 - The growth rate of the phototrophic purple...Ch. 14 - Prob. 2AQCh. 14 - A fatty acid such as butyrate cannot be fermented...Ch. 14 - When methane is made from CO2 (plus H2) or from...
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- Why would sulfur-oxidizing bacteria store sulfur? +arrow_forwardUse the multiple choice questions to identify what components of the redox loop would have to be in each numbered box for this organism to be able to produce ATP using this system. Do not worry about stoichiometry. a) What should be in box 1? MQ MQH2 Electron H+ b) What should be in box 2? MQ MQH2 Electron H+ c) What should be in box 3? MQ MQH2 Electron H+ d) What should be in box 4? MQ MQH2 Electron H+ e) What should be in box 5? MQ MQH2 Electron H+ f) What should be in box 6? MQ MQH2 Electron H+ g) What should be in box 7? MQ MQH2 Electron H+ h) What should be in box 8? MQ MQH2 Electron H+ i) Which boxes in the diagram directly result in increasing the pH gradient? (select all that apply) 1 2 3 4 5 6 7 8arrow_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
- 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 sulfidearrow_forwardWhen TSIA agar is inoculated with Salmonella typhimurium, the bacteria are growing in the butt of the tube and making ATP by cellular respiration. What type of cellular respiration is occurring and what final electron acceptor is being utilized?arrow_forwardWhy do boiled and unboiled potato extracts differ in their action on hydrogen peroxide? Explain in 1-3 sentencesarrow_forward
- How many water molecules are used for one complete turn of krebs cycle?arrow_forwardExplain why electron transport in purple photosynthetic bacteria follows a circular path.arrow_forwardA newly identified bacterium is unable to synthesize ubiquinone. A mobile electron carrier called CXC3 is used as a substitute. From the information provided in the table, calculate the delta G knot prime and the Keq value at 298 K for the redox reaction that occurs in this bacterium’s electron transport chain. Explain the impact that using CXC 3 instead of ubiquinol will have on ATP production in the cell. How might this cell adapt to this situation?arrow_forward
- Since cells of Halobacterium require high levels of Na+ for growth,why is this not true for the organism’s cytoplasmic enzymes?arrow_forwardWhy is oxygen toxic to some bacteria?arrow_forwardA denitrifying bacterium is strictly anaerobic. However, it possesses an electron transport chain allowing « respiration ». The final acceptor is nitrate (NO3) that is reduced in nitrite (NO₂). The electrons are introduced in the chain by the reduced nicotinamide adenine dinucleotide coenzyme (NADH + H*). 1- Write the net reaction of the electron transport chain used by the bacterium. 2- Calculate the corresponding standard Gibbs (free) energy of reaction. 3- Is the anaerobic respiration (using nitrate) more or less exergonic than the aerobic respiration (using O₂)? Justify your answer with numerical values.arrow_forward
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