The Light Independent Reaction--A.K.A. The Calvin Cycle

Essay by mjj328High School, 10th gradeA+, April 2004

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CO2 diffuses into the chloroplast and combines with RuBP to form a 6-Carbon sugar. The 6-carbon sugar immediately splits into 2 molecules of PGA. The PGA then takes an H from NADPH and a P from ATP and becomes PGAL. Some PGAL is then converted into glucose, most is used to build more RuBP. 6 turns are necessary for a molecule of glucose.

The light independent reaction takes place in the stroma.

-Equation:

6CO2 + 18ATP + 12NADPH2= C6H12O6 + 18ADP + 18P + 12NADP +6H2O

-Reactants:

ATP

NADPH

Enzymes

CO2

RuBP

-Products

Glucose

ADP+P

NADP+

Alternate Pathways:

-C4 Pathway: fixes carbon dioxide into 4-C compounds. Contains enzymes not inhibited by high carbon dioxide. Requires more energy, but plants are in abundant light. Ex- Corn, sugar cane

-CAM Pathway- plant takes in CO2 at night and stores it. Ex- cacti, pineapple