Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 9 - Test Your Understanding - Level 3 - Synthesis/Evaluation - Page 186: 12


Please see the image. The pH difference is maintained by a balance between the action of electron transport (increases the difference) and ATP synthesis (runs down the gradient/decreases the difference). With ATP production turned off by the poison, only the drive to increase the difference remains-- though there is probably an upper limit to this, as shown by the line eventually leveling off.

Work Step by Step

Ask yourself: why does the difference/gradient exist, and what generates it. What happens in the cell when there is a lack of ATP, and how does it relate to pH? Then consider what the poison mentioned in the question could do to disturb this balance
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