
Concept explainers
(a)
Interpretation: To determine the electron carrier NADH is associated with which of the protein complexes (I, II, III, and IV) of the ETC.
Concept introduction: Electron transport chain is a sequence of biochemical reactions in which electrons and hydrogen atoms from the citric acid cycle are transferred to various intermediate carriers and finally reacts with molecular oxygen to form a water molecule. There are four complexes associated with the electron transport chain that is present in the inner mitochondrial membrane. The four complexes that help in the electron transfer in the electron transport chain are:
Complex I:
Complex II:
Complex III:
Complex IV:
An overview of the electron transport chain is as follows:
(a)

Answer to Problem 23.91EP
NADH is associated with the complex I of the electron transport chain. Electrons from the citric acid cycle are transported to complex I through NADH molecule.
Explanation of Solution
Complex I consists of more than 40 structural subunits. Its structure has B-vitamin-containing flavin mononucleotide
(b)
Interpretation: To determine the electron carrier
Concept introduction: Electron transport chain is a sequence of biochemical reactions in which electrons and hydrogen atoms from the citric acid cycle are transferred to various intermediate carriers and finally reacts with molecular oxygen to form a water molecule. There are four complexes associated with the electron transport chain that is present in the inner mitochondrial membrane. The four complexes that help in the electron transfer in the electron transport chain are:
Complex I:
Complex II:
Complex III:
Complex IV:
An overview of the electron transport chain is as follows:
(b)

Answer to Problem 23.91EP
Explanation of Solution
NADH and FADH2from complex I and II transfers electrons to
In complex III,
(c)
Interpretation: To determine the electron carrier
Concept introduction: Electron transport chain is a sequence of biochemical reactions in which electrons and hydrogen atoms from the citric acid cycle are transferred to various intermediate carriers and finally reacts with molecular oxygen to form a water molecule. There are four complexes associated with the electron transport chain that is present in the inner mitochondrial membrane. The four complexes that help in the electron transfer in the electron transport chain are:
Complex I:
Complex II:
Complex III:
Complex IV:
An overview of the electron transport chain is as follows:
(c)

Answer to Problem 23.91EP
Explanation of Solution
Complex III consists of 11 structural subunits. Its structural subunits contain iron-sulfur proteins and various cytochromes.
Initially,
(d)
Interpretation: To determine that the electron carrier
Concept introduction: Electron transport chain is a sequence of biochemical reactions in which electrons and hydrogen atoms from the citric acid cycle are transferred to various intermediate carriers and finally reacts with molecular oxygen to form a water molecule. There are four complexes associated with the electron transport chain that is present in the inner mitochondrial membrane. The four complexes that help in the electron transfer in the electron transport chain are:
Complex I:
Complex II:
Complex III:
Complex IV:
An overview of the electron transport chain is as follows:
(d)

Answer to Problem 23.91EP
Explanation of Solution
Complex IV contains 13 structural subunits. It has two cytochrome units that have copper along with iron. The copper also participates in the
The diagrammatic representation of the electron transfer in complex IV in the electron transport chain is:
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Chapter 23 Solutions
General, Organic, and Biological Chemistry
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