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Lecture 9

Lecture 9: Photosynthesis II

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Western University
Biology 1002B
Niki Sharan

Lecture 9Photosynthesis II y Photosynthesis fixates about 105 Gtyear globallyabout half is terrestrial half is oceanicThe Calvin Cycley Stroma of the chloroplast y Endergonic processneeds the ATP from light reactions y RuBP is the major substrate that is needed to get this cycle workingit is a 5carbon sugar with two phosphates on each end y In one turn of the cycle one RuBP will react with one CO Summation of 3 turns giving us 3 CO molecules 2 2y The first stable product of the Calvin cycle is PGAfor every 3 turns 6 molecules of CO 2y Energy is needed in this process to drive the reductionreduced sugar is G3P y 1 molecules of G3P is made every 3 turns of the cycley 2 molecules of G3P gives you one 6carbon molecule of glucoseso essentially the cycle would have to spin 6 times to give off enough carbon to mak
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