In plants, after the light reactions convert solar energy to chemical energy in the form of ATP and NADPH, the anabolic Calvin cycle occurs. Carbon, which enters the Calvin cycle as CO2, leaves in the form of sugar. Also, the cycle consumes NADPH as reducing power to make sugar by adding high-energy electrons and spends energy in the form of ATP. The Calvin cycle consists of three main phases: carbon fixation, reduction, and regeneration of the CO2 acceptor.
In carbon fixation, the enzyme rubisco catalyzes the incorporation and attachment of each CO2 molecule one by one to ribulose biphosphate (RuBP), a five-carbon sugar.
This resulting six-carbon intermediate is short-lived because it is unstable; it splits in half, immediately forming two molecules of 3-phosphoglycerate for each CO2. Note that it is important to keep track of the number of molecules, and counting the total carbons is one good way to keep track. Originally there are 3 molecules of the 5-carbon RuBP (total: 15 carbons). If 3 CO2 molecules enter one at a time, then there are three 6-carbon intermediates (total: 18 carbons-15 carbons from the original RuBP + 3 carbons each CO2 molecule) and then six 3-phosphoglycerate molecules (total: 18 carbons).
Then reduction occurs as 6 ATP provide the six 3-phosphoglycerate molecules with another phosphate group. As a result, all of the six 3-phosphoglycerate molecules are now six 1,3 biphosphoglycerate. Each 1,3 biphosphoglycerate has 3 carbons, so there are still 18 total carbons. Next, the six 1,3 biphosphoglycerate molecules are reduced to six glyceraldehydes-3-phosphates by six pairs of electrons donated from six NADPH. To be even more detailed, the carboxyl group of the 3-phosphoglycerate (G3P) is reduced by the NADPH electrons to G3P's aldehyde group, which stores more energy. There is a net output of one G3P molecule, which becomes the starting material from which other organic compounds such as glucose are synthesized through various metabolic pathways. Note that G3P is the same 3-carbon sugar formed by the splitting of glucose in glycolysis. Also, there is now a total of 15 carbons in the Calvin cycle (18 carbons - 3 carbons that left in the outputted G3P).
Lastly, the carbon skeletons of the five remaining G3P molecules are rearranged into 3 molecules of 5-carbon RuBP with the help of three more molecules of ATP. The CO2 acceptor RuBP is regenerated and ready to receive CO2 once more as you can see from the total of 15 carbons in the cycle, and the Calvin cycle can now begin again. Also note that the Calvin cycle consumes 6 NADPH molecules and 9 ATP molecules in all for the net synthesis of one G3P molecule.
Adenosine triphosphate (ATP) is not directly involved in the Calvin Cycle. Rather, ATP is produced during the light-dependent reactions of photosynthesis and provides energy for the Calvin Cycle to function.
A. Calvin-Benson cycle is the exception as it is involved in carbon fixation during photosynthesis, while the other processes listed (Kreb cycle, fermentation, respiration, and glycolysis) are involved in degrading carbon compounds for energy production.
Both the citric acid cycle and the Calvin cycle are metabolic pathways found in living organisms. They both involve a series of chemical reactions that help in the production of energy or organic compounds. While the citric acid cycle occurs in the mitochondria and is involved in cellular respiration, the Calvin cycle takes place in the chloroplasts and is involved in photosynthesis.
Some of the enzymes found in the stroma of chloroplasts include ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO), phosphoglycerate kinase, glyceraldehyde-3-phosphate dehydrogenase, and phosphoenolpyruvate carboxylase. These enzymes are involved in the Calvin cycle and other metabolic pathways within the chloroplast.
The chloroplast is the organelle that participates in the Calvin cycle. Within the chloroplast, the stroma is where the Calvin cycle takes place.
John Calvin
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They are found in the light reaction. Photosystems not involved in Calvin cycle.
Adenosine triphosphate (ATP) is not directly involved in the Calvin Cycle. Rather, ATP is produced during the light-dependent reactions of photosynthesis and provides energy for the Calvin Cycle to function.
The two major sets of reactions involved in photosynthesis are the light-dependent reactions and the light-independent reactions (Calvin cycle). In the light-dependent reactions, light energy is used to produce ATP and NADPH, while in the Calvin cycle, ATP and NADPH are used to convert carbon dioxide into glucose.
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Glucose is not directly involved in the Calvin cycle. The Calvin cycle is a series of chemical reactions that occur in plants to convert carbon dioxide into glucose, which is a form of stored energy.
Calvin Coolidge was the vice-president and was not involved in the Tea Pot Dome or any other scandal.
light reactions and Calvin cycle reactions
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