Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 13.2, Problem 1TQ
Summary Introduction
To analyze:
The energy yield when thermophilic bacteria
Introduction:
Gibb’s free energy is a measure to determine the availability of energy to perform a function. Two types of factors affect the energy change (ΔG) of a reaction. They are internal properties of a reaction and external factors such as environmental conditions, concentration of reactants and products. Internal properties include ΔH (enthalpy change) and ΔS (entropy change). Environmental factors include pressure and temperature.Â
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Below are the reduction reactions for oxygen and FAD.
½202 + 2e + 2H+ → H20
E°' = 0.83 V
FAD + 2e + 2H* → FADH2
E" = -0.22 V
What is the potential (E") for the oxidation of FADH by oxygen?
What is the AG®' for the oxidation of FADH, by oxygen?
If we assume that the pumping of protons in conjunction with the oxidation of FADH, requires 120 kJ, what percentage of the energy from FADH oxidation is stored in the proton gradient (think about how many protons are pumped when FADH, transfers electrons to oxygen)?
The standard free energy change for the reaction catalyzed by phosphoglucomutase is -7.1
kJ/mol. Calculate the equilibrium constant for the reaction. Calculate AG at 37°C when the
concentration of glucose-1-phosphate is 1-mM and the concentration of glucose-6-phosphate is
25-mM. Is the reaction spontaneous under these conditions?
HOCH,
-20;POCH,
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H
H
H
H
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НО
ОН Н
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Glucose-l-phosphate
Glucose-6-phosphate
Ozone in the lower atmosphere is a pollutant that can form by the following reaction involving the oxidation of unburned hydrocarbons:CH4(g) + 8 O2(g)-------->CO2(g) + 2 H2O(g) + 4 O3(g)Use the standard free energies of formation to determine ΔG°rxn for this reaction at 25 °C.
Chapter 13 Solutions
Microbiology: An Evolving Science (Fourth Edition)
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