Biology Lecture 25

Biology Lecture 25 - 6 NADPH oxidized to NADP Water leaves...

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Biology Lecture 25 In cyclic electron flow, only PS I is running and produces ATP Oxygen is not produced neither is NADPH It’s believed to evolved before linear electron flow The Calvin cycle Anabolic process, builds sugar from CO2 using ATP and NADPH The end product is G3P Turns 3 times, fixes 3 molecules of CO2 to produce G3P Calvin cycle’s 3 phases: Carbon fixation (catalyzed by rubisco) Reduction Regeneration of the CO2 acceptor (RuBP) Carbon fixation 15 carbons Ribulose bisphosphate is catalyzed by rubisco, the most abundant enzyme on the planet. The final product is 6 3-carbon compounds for a total of 18 carbons. Reduction 6 ATP are added which then 6 NADPH are used. The final product is G3P, the same product as glycolysis. 18 carbons come out and 3 come out to form G3P. Regeneration G3P is reorganized with the help of ATP to form ribulose bisphosphate again. Calvin cycle summary 1 G3P is produced after 3 turns 9 total ATP consumed
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Unformatted text preview: 6 NADPH oxidized to NADP + Water leaves through the stomata, CO2 and O2 come in through it. Photorespiration O2 is added instead of CO2 to the Calvin cycle May be an evolutionary relic Limits damaging products of light reactions that build up in the absence of the Calvin cycle Rice, beans, and soy wheat are major products that we consume that are hurt by this C4 plants minimize the cost of photorespiration. They incorporate CO2 into 4-carbon compounds in mesophyll cells Use an enzyme called PEP carboxylase Mesophyll cells have PEP carboxylase, and it has a high affinity for CO2, forming a 4-carbon compound. This diffuses through the Plasmodesmata and forms a pyruvate and CO2. The CO2 enters the Calvin cycle to form sugar. CAM plants open their stomata at night incorporating CO2 into organic acids The stomata closes during the day and CO2 is released from organic acids and used in the Calvin cycle...
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This note was uploaded on 05/03/2011 for the course BIO 311 C taught by Professor Mcclelland during the Fall '09 term at University of Texas.

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Biology Lecture 25 - 6 NADPH oxidized to NADP Water leaves...

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