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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