Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Chapter 28.1, Problem 5MI
Summary Introduction
The biogeochemical cycle of iron is referred to as iron cycle. Iron present in wide range of oxidation states (-2 to +7). But, on earth, it is chiefly existing in its +2 or +3 redox state. Thus, iron cycle refers to cycling of iron between its +2 to +3 oxidation states. This mechanism can be abiotic or enabled by microbes. For example, the rusting of iron (Fe2+ is abiotically oxidized to Fe3+ by means of oxygen. Subsequently, the abiotic reduction of Fe3+ to Fe2+ by biological cycling of Fe2+ oxidizing microorganisms or by iron-sulfide minerals.
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Chapter 28 Solutions
Prescott's Microbiology
Ch. 28.1 - Prob. 1MICh. 28.1 - What microbes are capable of methanogenesis and...Ch. 28.1 - Prob. 1.1CCCh. 28.1 - Prob. 1.2CCCh. 28.1 - Prob. 1.3CCCh. 28.1 - Prob. 1.4CCCh. 28.1 - Prob. 1.5CCCh. 28.1 - What are the products of denitrification,...Ch. 28.1 - Prob. 2.1CCCh. 28.1 - Prob. 2.2CC
Ch. 28.1 - Prob. 2.3CCCh. 28.1 - Prob. 2.4CCCh. 28.1 - Prob. 4MICh. 28.1 - Prob. 5MICh. 28.1 - Compare the products of dissimilatory sulfate...Ch. 28.1 - Prob. 3.2CCCh. 28.1 - Prob. 3.3CCCh. 28.1 - Prob. 3.4CCCh. 28.1 - Suggest how a chemolithoautotroph might link the...Ch. 28.2 - What organisms benefit from nitrification?Ch. 28.2 - List three greenhouse gases. Discuss their...Ch. 28.2 - Prob. 2CCCh. 28.2 - How do changes in the nitrogen cycle caused by...Ch. 28.2 - Prob. 4CCCh. 28 - Prob. 1RCCh. 28 - Prob. 2RCCh. 28 - Prob. 3RCCh. 28 - Prob. 5RCCh. 28 - Prob. 6RCCh. 28 - Prob. 7RCCh. 28 - Prob. 8RCCh. 28 - Prob. 1ALCh. 28 - A bacterium isolated from sewage sludge was...Ch. 28 - Prob. 3ALCh. 28 - Prob. 4AL
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- Why does TPP Thiamine pyrophospate, act as an electron sink? What is it abut its structure that makes it possible?arrow_forwardWhy do the cytochrome electron-transfer processes have different standard reduction potentials, despite the fact that they all utilize the identical iron oxidation–reduction reaction?arrow_forwardWhat property of the various cytochromes ensures unidirectional electron flow along the electron-transport chain?arrow_forward
- With H2 as electron donor, why is reduction of Fe3+ a morefavorable reaction than reduction of fumarate?arrow_forwardWhy does biological Fe2+ oxidation under oxic conditions occurmainly at acidic pH?arrow_forwardWhat citric acid cycle enzyme is also a component of the electrontransport chain?arrow_forward
- In nitrogen acquisition, what two metabolic pathways generate NH4+?Describe each one focusing on the form of inorganic nitrogen that is converted intoNH4+. Write the overall net reactions for eachmetabolic pathway.arrow_forwardWhat are the P:O ratios for electrons donated by matrix NADH and by succinate?arrow_forwardIf nitrate is used as the terminal electron acceptor in the electron transport system of a bacterium,how many ATPs could be synthesized?arrow_forward
- Define an oxidation/reduction (redox) reaction. Why are redox reactions important in cellular respiration?arrow_forwardWhat is the oxidative phosphorylation coefficient? indicate the oxidative phosphorylation coefficient of the primary electron donors in krebs cyclearrow_forwardIn terms of intermediates, how does the Sox system differ fromother sulfide-oxidizing systems?arrow_forward
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