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What are the direct products of the Calvin cycle?
- - the direct product is a 3-carbon sugar known as g3p or PGAL, not glucose.
- - Furthemore, the c and o atoms are supplied form the co2 and the hydrogens are supplied from photolysis of h20 in stage one
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where does the Calvin cycle occur?
- -This occurs in the stroma of the chloroplast.
- - It also includes the products of the light-dependent reactions such as ADP, PI WATER, and NADP
- -Reactants which are carbon dioxide that enters through the stomata, AtP, NADPH AND RUBP
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The 3 steps of the Calvin cycle
- 1 ) co2 fixation and reduction
- 2) PGAL / G3P are produced
- 3) regeneration of the RUGP to allow for the cycle to take place forever
- - each cycle requires enzymes and obtains water as a byproduct.
- - 3 Atps and 2 NADPHs are consumed by on co2. So, in order to make a glucose molecule, you will need to have gone through at least 6 cycles and have used 18ATP'S and 2 NADPH'S.
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Stage one in detail ( carbon fixation)
- - carbon atom in co2 becomes chemically bonded to Rubp ( ribulose biphosphate that has five carbons) with an enzyme known as RUBP carboxylase ( also known as Rubsico).
- - The result of this process is a six-carbon compound which is unstable and results in it immediately breaking down into two three-carbon identical molecules that are now stable. ( also known as sleepy PGA.
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Step 2 in detail = PGAL production
- - Now these 2, 3 carbon molecules are now in a low energy state. So, they are then activated by ATP and NADPH ( accept energy from these molecules).
- - Then these two, 3 carbon molecules are reduced into PGAL( also known as G3p)
- - Then this one PGAL goes to the waiting room and combines withe other molecules there to form a glucose
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PGAL'S function
- -provides chemical energy for the cell.
- -combines to form glucose = stored energy for cells
- -5 of the carbons are recycled to go make up RUBP
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stage 3 = Regeneration of RUGP
- So, the 5 carbons of PGAL move on forward to from RUBP and only 1 one carbon is available to form glucose.
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summary for this cycle
- Pga is produced and unstable and converts to PGAL. Then PGAL COMBINES to form Rubp again. Furthermore, 1 glucose for every 6 turns
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products of this cycle
water , pgal ( g3p), adp, pi, Nadp+ , H+
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