Prescott's Microbiology
10th Edition
ISBN: 9781259281594
Author: Joanne Willey, Linda Sherwood Adjunt Professor Lecturer, Christopher J. Woolverton Professor
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 10.4, Problem 1RIA
How is the direction of electron flow between conjugate redox pairs related to the standard reduction potential and the release of free energy?
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An iron-sulfur protein in Complex 3 donates an electron to cytochrome c1. The reduction half-reactions and Eº' values are shown below. a) write the balanced equation for the reaction and calculate the standard free energy change. b) How can you account for the fact that this reaction occurs spontaneously in the cell?
FeS(ox) + e- ---> FeS(red) Eº' = 0.280 V
cyt c1 (Fe3+) + e- ---> cyt c1 (Fe2+) Eº' = 0.215 V
When electrons flow from the NAD+ /NADH conjugate redox pair to the 1/2 O2/H2O redox pair, does the reaction begin with NAD1 or with NADH? What is produced—O2 or H2O?
With the standard reduction potentials given,
standard reduction 1 = -0.185
standard reduction 2 = -0.320
a) Which reduction will the electrons flow FROM the electron donor?
b) Which reduction is the electron acceptor where the electrons will flow to?
Chapter 10 Solutions
Prescott's Microbiology
Ch. 10.1 - Figure 10.2 The Relationship of G to the...Ch. 10.1 - What kinds of work are carried out in a cell?...Ch. 10.1 - What is thermodynamics? Summarize the first and...Ch. 10.1 - Define entropy and enthalpy. Do living cells...Ch. 10.1 - Prob. 4RIACh. 10.1 - Prob. 5RIACh. 10.2 - Why is ATP called a high-energy molecule? How is...Ch. 10.2 - Describe the energy cycle and ATPs role in it....Ch. 10.3 - Prob. 1MICh. 10.3 - Prob. 2MI
Ch. 10.4 - Figure 10.6 Electron Movement and Reduction...Ch. 10.4 - How is the direction of electron flow between...Ch. 10.4 - When electrons flow from the NAD+/NADH conjugate...Ch. 10.4 - Which among the following would be the best...Ch. 10.4 - In general terms, how is G related to E0? What is...Ch. 10.4 - Name and briefly describe the major electron...Ch. 10.6 - Will an enzyme with a relatively high Km have a...Ch. 10.6 - Prob. 2MICh. 10.6 - What is an apoenzyme? A holoenzyme? What are the...Ch. 10.6 - Illustrate the effect enzymes have on the...Ch. 10.6 - How does enzyme activity change with substrate...Ch. 10.6 - What special properties might an enzyme isolated...Ch. 10.6 - What are competitive and noncompetitive...Ch. 10.6 - How are enzymes and ribozymes similar? How do they...Ch. 10.7 - Figure 10.19 Allosteric Regulation. The structure...Ch. 10.7 - Figure 10.21 Feedback Inhibition. Feedback...Ch. 10.7 - Briefly describe the three ways a metabolic...Ch. 10.7 - Define the terms metabolic channeling and...Ch. 10.7 - Define allosteric enzyme and allosteric effector.Ch. 10.7 - Prob. 4RIACh. 10.7 - Prob. 5RIACh. 10.7 - What is the significance of the fact that...Ch. 10 - Examine the structures of macromolecules in...Ch. 10 - Most enzymes do not operate at their biochemical...Ch. 10 - Examine the branched pathway shown here for the...Ch. 10 - Prob. 4CHI
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- which staments are falsearrow_forwardDiscuss the relationship between redox potentials E0’ and the organization of the components of the electron transport chain. Be specific, i.e., use data/actual values to back up your discussion. a) What are the values of E0’ for all the components of the ETS? b)How are the E0’ related to ∆G values? c) How do the values of E0’ vary among the participants in the ETS relative to their position in the ETS?arrow_forwardWhat is the definition of a final electron acceptor and where can it be found?arrow_forward
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- Shown below are reduction potentials for four half-reactions. Which of the coupled reactions is favorable? (Note that for Cytochrome c you must multiply the reduction potential by 2 for each coupled reaction because only one electron is involved) a) 2 Cytochrome c (Fe3+) + H2O ó 2 Cytochrome c (Fe2+) + O2 b) NADH + Succinate- ó NAD+ + Fumarate- c) Fumarate- + H2O ó Succinate- + O2 d) All of the abovearrow_forwardWhat is the mechanism of an enzyme reaction involving a coenzyme for Nucleophilic Addition Rxns? Givearrow_forwardWhat are the P:O ratios for electrons donated by matrix NADH and by succinate?arrow_forward
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