Answer
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.
Campbell Biology (12th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0135188741
ISBN 13:
978-0-13518-874-3
Chapter 7 - 7.4 - Concept Check - Page 139: 2
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