Biochemistry
Biochemistry
6th Edition
ISBN: 9781305577206
Author: Reginald H. Garrett, Charles M. Grisham
Publisher: Cengage Learning
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Chapter 21, Problem 14P

The Source of the Oxygen Atoms in Photosynthetic O2 Evolution

The overall equation for photosynthetic CO2 fixation is 6CO2 + 6H2O C6H122O6 + 6O2All the O atoms evolved as O2 come from water; none comes from carbon dioxide. But 12 O atoms are evolved as 6 O2, and only 6 O atoms appear as 6 H2O in the equation. Also, 6 CO2 have 12 O

Atoms, yet there are only 6 O atoms in C6H12O6. How can you account for these discrepancies? (Hint: Consider the partial reactions of photosynthesis: ATP synthesis, NADP reduction, photolysis of water, and the overall reaction for hexose synthesis in the Calvin-Benson cycle)

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Photosystem II uses sunlight to strip electrons (and protons) away from which of the following substrate molecules (in the chloroplasts of green plants and green algae)? C6H12O6 only C6H12O6, H2O, and CO2 only CO2 only H2O and C6H12O6 only H2O only
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Photosynthesis & Respiration | Reactions | Chemistry | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=3XIyweZg6Sw;License: Standard YouTube License, CC-BY