Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 7 - How Cells Harvest Energy - Review Questions - Apply: 2

Answer

B.

Work Step by Step

The direct source is what actually powers the ATP synthase, and this is the proton gradient which is run down as its energy is transferred to the bond in ATP by the ATP synthase. A. and D. both participate in providing this energy, but not directly but, rather, earlier in the whole process. Substrate-level phosphorylation occurs during glycolysis and does not involve the ATP synthase.
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