Answer
b.
Work Step by Step
Facilitated diffusion uses transport proteins to move a solute down its concentration gradient. Because the concentration gradient of the solute is used to drive the process, the transport protein does not need energy.
Campbell Biology: Concepts & Connections (9th Edition)
by Taylor, Martha R.; Simon, Eric J.; Dickey, Jean L.; Hogan, Kelly A.; Reece, Jane B.
Published by
Pearson
ISBN 10:
0-13429-601-X
ISBN 13:
978-0-13429-601-2
Chapter 5 - Review - Page 91: 7
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