Campbell Biology (11th Edition)

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

Chapter 9 - 9.4 - Concept Check - Page 178: 3


In the operation of the electron transport chain, ubiquinone must move through the membrane between complexes I and III, which can only occur is the membrane is fluid.

Work Step by Step

Look at Fig. 9.15. The one obvious thing requiring a fluid membrane is the movement of ubiquinone ("Q"). All of the other components are inserted in the membrane or attached to its outside, but no others move through it.
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