Campbell Biology (11th Edition)

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

Chapter 7 - 7.4 - Concept Check - Page 139: 2


An electrochemical gradient must be maintained, which requires ATP.

Work Step by Step

Ions would not naturally drift to create an unbalanced gradient without active transport. This requires energy in the form of ATP.
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