Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 10 - Photosynthesis: Energy from Sunlight - 10.4 - Planta Have Adapted Photosynthesis to Environmental Conditions - 10.4 Recap - Learning Outcomes - Page 209: 2

Answer

ATP must be used to return the three-carbon molecule from the bundle sheath cell and prepare it to take up another molecule of carbon dioxide from its surroundings. Since the mesophyll cells constantly pump carbon dioxide into neighboring bundle-sheath cells in the form of malate, a high carbon dioxide to oxygen ratio is maintained around the catalyst rubisco.

Work Step by Step

ATP must be used to return the three-carbon molecule from the bundle sheath cell and prepare it to take up another molecule of carbon dioxide from its surroundings. Since the mesophyll cells constantly pump carbon dioxide into neighboring bundle-sheath cells in the form of malate, a high carbon dioxide to oxygen ratio is maintained around the catalyst rubisco.
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