Lecture7PrimaryProduction

Lecture7PrimaryProduction - Light Independent Reactions...

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Unformatted text preview: Light Independent Reactions Light Independent Reactions of of Photosynthesis Photosynthesis (Dark Reactions) (Dark Reactions) These are the synthesis reactions These are the synthesis reactions Occur as a cyclic pathway called the Occur as a cyclic pathway called the Calvin-Benson Cycle Calvin-Benson Cycle Reactions are driven by energy from ATP (made where?) NADPH (made where?) delivers hydrogen and electrons to build sugars Carbon dioxide (comes from?) provides carbon and oxygen sunlight water uptake carbon dioxide uptake ATP ADP + P i NADPH NAD + glucose P oxygen release LIGHT INDEPENDENT REACTIONS LIGHT DEPENDENT REACTIONS new water Photosynthesis occurs in two stages: The Light-Dependent & the Light-Independent Reactions (thylakoid) (stroma) NADP+ 12 12 NADPH 12 PGAL 12 ADP 12 P i 12 NADP + ATP CARBON FIXATION 6 CO 2 6 6 RuBP unstable intermediate ATP 6 ADP 6 4 P i P 10 glucose PGAL 2 P i P PGAL 12 PGA CALVIN-BENSON CYCLE RUBISCO Two PGAL combine, forming glucose-P Six turns of this cycle regenerate enough RuBP Six turns of this cycle regenerate enough RuBP to replace those used in C fixation to replace those used in C fixation ADP, NADP+ and Pi diffuse through the stroma ADP, NADP+ and Pi diffuse through the stroma and back to sites of light dependent reactions and back to sites of light dependent reactions Phosphorylated glucose is ready to be Phosphorylated glucose is ready to be incorporated into larger molecules incorporated into larger molecules Algae and plants use it as a building block for Algae and plants use it as a building block for carbohydrates like cellulose and starch carbohydrates like cellulose and starch Products of photosynthesis can be broken down Products of photosynthesis can be broken down (used as energy), or as building blocks for amino (used as energy), or as building blocks for amino acids, lipids, etc acids, lipids, etc Fatty acids Nucleotides DNA http://www.mie.utoronto.ca/labs/lcdlab/biopic/fig/3.12c.jpg www.wikipedia.com 13.5 Primary Production 13....
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Lecture7PrimaryProduction - Light Independent Reactions...

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