The Light Independent Reactions - Weebly
The Light Independent Reactions
• Also known as the Calvin Cycle
• Occurs in chloroplast stroma
• Energy to supply reactions comes from ATP and NADPH formed in the light reaction
There are three major stages to the Calvin cycle:
1. Stage 1 - Carbon fixation
CO2 from the atmosphere reacts with ribulose biphosphate
RuBP) two 3C phosphoglycerate molecules (PGA) are
produced.
- catalyzed by RUBISCO (most abundant protein in nature)
2. Stage 2 - Reduction
PGA molecules are phosphorylated using ATP and then
reduced by NADPH to produce PGAL.
3. Stage 3 - Reformation of RuBP
Some of the PGAL is converted to glucose
(2 PGAL makes 1 glucose)
- plants may use glucose as a building block to make other
sugars, starch, fats, amino acids, nucleotides and other
molecules
Majority of PGAL is used to regenerate RuBP.
- PGAL is converted to ribulose phosphate which is
phosphorylated to form RuBP.
Assignment:
Summarize, in a chart, the following facts about the LIGHT INDEPENDENT REACTIONS (a.k.a. the Calvin Cycle):
• Location of the Light Independent Reactions
• Number of carbon dioxide molecules required to produce one glucose molecule
• Number of NADPH used to from one glucose molecule
• Number of ATP used to form one glucose molecule
• Source of ATP and NADPH for this series of reactions
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