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.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:The overall process that is called the Calvin-Benson cycle or the dark reactions of photosynthesis is
shown in the following figure:
3 ADP
SP 00000P
RuBP
Phase 3:
Regeneration
of RuBP
Rubisco
Input 3 CO2, entering one per cycle
Phase 1: Carbon fixation
$000P
G3P
Calvin
Cycle
0908
3-Phosphoglycerate
SPOOOP
1,3-Bisphosphoglycerate
10-0-0-P
G3P
Output
6 ADP
908
G3P
NADP
OP,
NADPH
Phase 2:
Reduction
Glucose and
other organic
compounds
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.
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