Electrons are continuously transferred from higher-energy carriers to lower-energy carriers in the electron transport chain, yet somehow iron is utilized as an electron carrier multiple times. Choose the most likely reason why this is possible.The pH of complex II is slightly higher than the pH of complex III.The reduction potential of flavin mononucleotide (FMN) in complex I is higher than the reduction potential of iron.The redox potential of iron ions can be manipulated by their environment. For instance, the iron in an iron-sulfur cluster will have a different redox potential than the iron in a heme group.The electrons carried by NADH are higher energy than the electrons carried by FADH2.

Electron transport When the electrons pass into the electron transport chain through reoxidation of…

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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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Electrons are continuously transferred from higher-energy carriers to lower-energy carriers in the electron transport chain, yet somehow iron is utilized as an electron carrier multiple times. Choose the most likely reason why this is possible.

The pH of complex II is slightly higher than the pH of complex III.
The reduction potential of flavin mononucleotide (FMN) in complex I is higher than the reduction potential of iron.
The redox potential of iron ions can be manipulated by their environment. For instance, the iron in an iron-sulfur cluster will have a different redox potential than the iron in a heme group.
The electrons carried by NADH are higher energy than the electrons carried by FADH2.

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