Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Textbook Question
Chapter 10.4, Problem 1CC
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
In a coupled reaction, how can you tell the electron donor halfreaction from the electron acceptor half reaction?
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 - Prob. 1CCCh. 10.1 - Prob. 2CCCh. 10.1 - Prob. 3CCCh. 10.1 - Prob. 4CCCh. 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. 2MICh. 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 - Prob. 1CCCh. 10.6 - Prob. 2CCCh. 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 - Prob. 2MICh. 10.7 - Define the terms metabolic channeling and...Ch. 10.7 - Define allosteric enzyme and allosteric effector.Ch. 10.7 - Prob. 3CCCh. 10.7 - Prob. 4CCCh. 10.7 - Prob. 5CCCh. 10 - Prob. 1RCCh. 10 - Prob. 2RCCh. 10 - Prob. 3RCCh. 10 - Examine the structures of macromolecules in...Ch. 10 - Examine the branched pathway shown here for the...Ch. 10 - Prob. 3AL
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- Discuss 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_forwardFor the following reaction[FAD] + 2 cyt c (Fe 2+) + 2 H+ —> [FADH2] + 2 cyt c (Fe+3)determine which of the redox couples is the electron acceptor and which is the electron donor under standard-state conditions, calculatethe value of ΔE and determine the free energy change for the reaction.arrow_forwardDetermine whether or not reaction is a redox reaction. For each redox reaction, identify the oxidizing agent and the reducing agent. HBr(aq) + KOH(aq)--------> H2O(l) + KBr(aq)arrow_forward
- what is an electron tansport chain?arrow_forwardOutline the flow of electrons from succinate to Ubiquinone through complex 2:arrow_forwardIf 100% of the free energy from the metabolism of glucose is used for the conversion of ADP to ATP, how manymolecules of ATP can be produced from each gram of glucose (mm = 180.16)?arrow_forward
- 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_forwardc) As oxygen steals 2 electrons from protein complex IV, a chemical (REDOX) reaction starts. Write the full reaction with all involved reactant(s) and product(s) that happen at the base of protein complex IV, and circle/highlight the reactant involved that helps power chemiosmosis.arrow_forwarda newly identified bacterium called Nomore biochem is unable to synthesize ubiquinone. A mobile electron carrier called CXC3 is used as a substitute. From the information provided in the table, calculate delta G' and Keq value at 298K for the redox reaction that occurs in the Nomore Biochem electron transport chain. (constants: R=8.3 J/degree x mol, F= 96.1 kJ/v x mol Half Reactions E' (V) ubiquinone + 2e- + 2H+--> Ubiquinol + H2 0.045 NAD+ + 2e- + 2H+ --> NADH + H+ -0.320 CXC3 + 2e- + 2H+ --> CXC3H2 -0.450 explain the impact that using CXC3 instead of ubiquinone will have on ATP production in the cell. How might the cell adapt to this situation?arrow_forward
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