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Biochemistry 4th Edition by Reginald Garrett, Charles Grisham
Edition 4ISBN: 9780495109358Biochemistry 4th Edition by Reginald Garrett, Charles Grisham
Edition 4ISBN: 9780495109358 Exercise 14
The source of the oxygen atoms in photosynthetic O2 evolution
The overall equation for photosynthetic CO2 fixation is
6 CO2 + 6 H2 O * C 6 H 12 O 6 + 6 O2
All 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 as 6 H2 O 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.)
The overall equation for photosynthetic CO2 fixation is
6 CO2 + 6 H2 O * C 6 H 12 O 6 + 6 O2
All 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 as 6 H2 O 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.)
Explanation
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The net reaction of the Calvin Cycle is ...
Biochemistry 4th Edition by Reginald Garrett, Charles Grisham
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