CO2
The molecule used to replenish RuBP in the Calvin Cycle is phosphoglycerate (PGA). PGA is converted to RuBP through a series of enzymatic reactions, allowing the cycle to continue and fix more carbon dioxide.
You phosphorylate glycerol-3-phosphate (all 5 G3P ) with three ATP and you get ribulose bisphosphate, RuBP, and begin the Calvin cycle again
Carbon dioxide
RuBP
RuBP
The molecule used to replenish RuBP in the Calvin Cycle is phosphoglycerate (PGA). PGA is converted to RuBP through a series of enzymatic reactions, allowing the cycle to continue and fix more carbon dioxide.
You phosphorylate glycerol-3-phosphate (all 5 G3P ) with three ATP and you get ribulose bisphosphate, RuBP, and begin the Calvin cycle again
Carbon dioxide
During the Calvin cycle, three molecules of G3P are required to regenerate one molecule of RuBP.
RuBP
Yes, the Calvin cycle requires RuBP (ribulose-1,5-bisphosphate) as it is the starting molecule for carbon fixation. RuBP reacts with CO2 to form an unstable intermediate that eventually leads to the synthesis of sugars such as glucose.
Regenerating RuBP during the Calvin Cycle is necessary because RuBP is the molecule that captures carbon dioxide from the atmosphere and initiates the process of carbon fixation. Without regenerating RuBP, the Calvin Cycle would not be able to continue and produce glucose, which is essential for plant growth and energy production.
RuBP
RuBP
RuBP
RuBP
The last step of the Calvin cycle is regeneration of RuBP (Ribulose-1,5-bisphosphate) using ATP to continue the cycle. This is necessary to replenish the RuBP molecules that are used in the initial carbon fixation step.