Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 9 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 183: 1

Answer

C. H^{+} concentration gradient across the membrane holding ATP synthase.

Work Step by Step

Option C describes the immediate source while A and B talk about how the ultimate source is generated. D is wrong since it describes the process of making ATP, not the source of the energy.
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