Please compute the standard transformed free energy change as electrons enter the electron transport chain at complex III and proceed to completely reduce diatomic oxygen to water (Do not be concerned about each step and intermediate in the transfer chain, but only the initial donor and final acceptor).
Please compute the standard transformed free energy change as electrons enter the electron transport chain at complex III and proceed to completely reduce diatomic oxygen to water (Do not be concerned about each step and intermediate in the transfer chain, but only the initial donor and final acceptor).
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Please compute the standard transformed free
energy change as electrons enter the electron
transport chain at complex III and proceed to
completely reduce diatomic oxygen to water (Do
not be concerned about each step and
intermediate in the transfer chain, but only the
initial donor and final acceptor).
TABLE 18.1 Standard reduction potentials of some reactions
Oxidant
Reductant
E, (V)
Succinate + CO2
a-Ketoglutarate
Acetaldehyde
Ferredoxin (reduced)
H2
- 0.67
- 0.60
- 0.43
Acetate
Ferredoxin (oxidized)
1
2 H*
- 0.42
- 0.32
NAD*
NADH + H*
NADP*
NADPH + H*
- 0.32
Lipoate (oxidized)
Glutathione (oxidized)
- 0.29
- 0.23
- 0.22
- 0.20
- 0.19
Lipoate (reduced)
Glutathione (reduced)
2
FAD
FADH,
Acetaldehyde
Pyruvate
Fumarate
Ethanol
Lactate
Succinate
2
0.03
Cytochrome b (+3)
Dehydroascorbate
Ubiquinone (oxidized)
Cytochrome c (+3)
Fe (+3)
Cytochrome b (+2)
Ascorbate
1
0.07
0.08
Ubiquinone (reduced)
Cytochrome c (+2)
Fe (+2)
H,O
0.10
1
0.22
1
0.77
0, + 2 H*
0.82
Note: E, is the standard oxidation-reduction potential (pH 7, 25°C) and n is the number
of electrons transferred. E, refers to the partial reaction written as
Oxidant +e → reductant
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