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Lecture 26-Photosynthesis 2

Lecture 26-Photosynthesis 2 - Lecture 26 Photosynthesis II...

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Lecture 26- Photosynthesis II Calvin Cycle -Light independent; uses CO 2 , ATP and NADPH as inputs -Cycle releases ADP, NADP+, G3P, and Pi -Takes place in chloroplast stroma -Three stages: 1) Carboxylation -A carbon atom from CO 2 is added to ribulose 1,5 biphosphate (RuBP), a 5 carbon sugar, to produce two three-carbon molecules of 3-phosphoglycerate (3PGA). 2) Reduction -Reactions using NADPH and ATP from the light-dependant reactions convert 3PGA into G3P, another three-carbon molecule, ½ molecule of glucose. 3) Regeneration -Some G3P molecules are used to produce the five-carbon RuBP (using ATP) Then the cycle begins again… -1 G3P is produced for every 3 turns of the cycle -NADPH is used to reduce the carbon compound (becomes NADP+) -Respiration is measured by either oxygen consumption or CO 2 release -Photosynthesis is measured by either oxygen release of CO 2 consumption Light Saturation Curve -For the cell (e.g., a eukaryote with mitochondria and chloroplasts) to grow, a light intensity is required
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