Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 9 - Pathways That Harvest Chemical Energy - 9.3 - Oxidative Phosphorylation Forms ATP - 9.3 Recap - Learning Outcomes - Page 184: 2

Answer

The energy released from the electron transport chain is used to pump protons from the matrix to the inter-membrane space, reducing H+ ions in the matrix and establishing an H+ gradient and a charge-distribution gradient known as the proton-motive force across the membrane. Protons driven by the proton-motive force diffuse back to the matrix through a channel protein called the ATP Synthase, which couples the diffusion with ATP synthesis.

Work Step by Step

The energy released from the electron transport chain is used to pump protons from the matrix to the inter-membrane space, reducing H+ ions in the matrix and establishing an H+ gradient and a charge-distribution gradient known as the proton-motive force across the membrane. Protons driven by the proton-motive force diffuse back to the matrix through a channel protein called the ATP Synthase, which couples the diffusion with ATP synthesis.
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