CP Bioloogy A - Photosynthesis

CP Bioloogy A - Photosynthesis - Mehmet Bayram 11/12/05...

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Mehmet Bayram 11/12/05 Mrs. Maggio The Calvin Cycle The Calvin Cycle is the second set of reactions in photosynthesis which was discovered by Melvin Calvin (1911-1997). It is also know as the Calvin Benson cycle, or the C 3 pathway. The Calvin Cycle makes organic compounds using the energy from ATP (Adenosine Triphosphate) and NADPH. In the Calvin Cycle, the carbon atoms from CO 2 are bonded with the organic compounds. This process is called carbon fixation. The Calvin Cycle has three steps which all occur within the stroma of the chloroplast. Step1: CO 2 diffuses into the stroma. An enzyme combines CO 2 with a five carbon Carbohydrate which is called RuBP. This process makes a six carbon Molecule that splits into a pair of 3 carbon Molecules know as PGA. Step 2: PGA is changed into another three-carbon molecule called PGAL in another process. Each PGA molecule gets a phosphate group from ATP. The resulting compound gets a proton from NADPH and then releases the phosphate group making PGAL. While producing PGAL,
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CP Bioloogy A - Photosynthesis - Mehmet Bayram 11/12/05...

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