The overall process that is called the Calvin-Benson cycle or the dark reactions of photosynthesis is shown in the following figure: Input 3 CO₂, entering one per cycle Phase 1: Carbon fixation 3 ADP Rubisco SPOOOOOP RuBP Phase 3: Regeneration of RuBP 10008 G3P Calvin Cycle 10009 3-Phosphoglycerate SP 1,3-Bisphosphoglycerate 10008 G3P 1000-P G3P Output ADP GP, *Glucose and other organic compounds NADPH NADP Phase 2: Reduction A. The enzyme RUBISCO is sometimes called the most important protein in the planet. Why is this so? What makes this enzyme central for our own existence as an organism? B. What process in the chloroplast is used to provide the ATP and NADPH that drive the Calvin Cycle? C. Suppose that a chloroplast is supplied with both light and carbon dioxide. Subsequently, the light is kept on, but the carbon dioxide supply is turned off. Using the diagram above, predict what will happen in this situation to the levels of 3-phosphoglycerate and ribulose bisphosphate (RuBP), respectively.

The overall process that is called the Calvin-Benson cycle or the dark reactions of photosynthesis is shown in the following figure: Input 3 CO₂, entering one per cycle Phase 1: Carbon fixation 3 ADP Rubisco SPOOOOOP RuBP Phase 3: Regeneration of RuBP 10008 G3P Calvin Cycle 10009 3-Phosphoglycerate SP 1,3-Bisphosphoglycerate 10008 G3P 1000-P G3P Output ADP GP, *Glucose and other organic compounds NADPH NADP Phase 2: Reduction A. The enzyme RUBISCO is sometimes called the most important protein in the planet. Why is this so? What makes this enzyme central for our own existence as an organism? B. What process in the chloroplast is used to provide the ATP and NADPH that drive the Calvin Cycle? C. Suppose that a chloroplast is supplied with both light and carbon dioxide. Subsequently, the light is kept on, but the carbon dioxide supply is turned off. Using the diagram above, predict what will happen in this situation to the levels of 3-phosphoglycerate and ribulose bisphosphate (RuBP), respectively.

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter21: Photosynthesis

Section: Chapter Questions

Problem 16P

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