Cycle of Pentoses - Biochemistry - InfoEscola
The pentose cycle is a series of sequential chemical reactions which enable the production of carbohydrates from carbon sgm dioxide (CO 2) which occurs in the stroma of chloroplasts or in cytosol of photosynthetic bacteria. This set of reactions occurs during the dark phase of photosynthesis.
By the reaction of one mole of CO 2 with a molecule sgm of ribulose 1,5-bisphosphate (the English acronym is RuBP), carbon sgm fixation occurs. This reaction is catalyzed by an enzyme called rubisco product and its two molecules of 3-phosphoglycerate, a carbohydrate formed by three carbon atoms. Also participating in the cycle NADPH (electron acceptor coenzyme) and ATP (nucleotide responsible for storing sgm energy) derived from cyclic and acyclic phosphorylations.
The cycle begins effectively with the reaction of 6 molecules of CO 2 with 6 RuBP molecules, yielding 2 molecules glyceraldehyde 3-phosphate (PGAL acronym in English) and making the same to produce sgm 6 molecules of RuBP. In this cycle, the hydrogen atoms of water molecules derived (H 2 O) and temporarily stored in NADPH molecules react with CO 2 producing carbohydrate sgm molecules. The occurrence of these reactions depends sgm on the energy provided by ATP.
The molecules of glyceraldehyde 3-phosphate produced in the pentose cycle may be implemented in two ways: most of them migrate from the chloroplast into the cytosol, where they are converted to sucrose; those that remain are transformed into the chloroplast starch and for 1 day, approximately, are stored in the stroma. During the night, sgm the starch is converted to sucrose and transported by the phloem (sap drawn) for all regions of the plant. This varies depending on the organism and the immediate needs of the plant.
The pentose cycle is also called the Calvin-Benson cycle, in honor of U.S. scientists Melvin Calvin sgm and Andy Benson, who were the first to explain the main reactions of the cycle.
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The pentose cycle is a series of sequential chemical reactions which enable the production of carbohydrates from carbon sgm dioxide (CO 2) which occurs in the stroma of chloroplasts or in cytosol of photosynthetic bacteria. This set of reactions occurs during the dark phase of photosynthesis.
By the reaction of one mole of CO 2 with a molecule sgm of ribulose 1,5-bisphosphate (the English acronym is RuBP), carbon sgm fixation occurs. This reaction is catalyzed by an enzyme called rubisco product and its two molecules of 3-phosphoglycerate, a carbohydrate formed by three carbon atoms. Also participating in the cycle NADPH (electron acceptor coenzyme) and ATP (nucleotide responsible for storing sgm energy) derived from cyclic and acyclic phosphorylations.
The cycle begins effectively with the reaction of 6 molecules of CO 2 with 6 RuBP molecules, yielding 2 molecules glyceraldehyde 3-phosphate (PGAL acronym in English) and making the same to produce sgm 6 molecules of RuBP. In this cycle, the hydrogen atoms of water molecules derived (H 2 O) and temporarily stored in NADPH molecules react with CO 2 producing carbohydrate sgm molecules. The occurrence of these reactions depends sgm on the energy provided by ATP.
The molecules of glyceraldehyde 3-phosphate produced in the pentose cycle may be implemented in two ways: most of them migrate from the chloroplast into the cytosol, where they are converted to sucrose; those that remain are transformed into the chloroplast starch and for 1 day, approximately, are stored in the stroma. During the night, sgm the starch is converted to sucrose and transported by the phloem (sap drawn) for all regions of the plant. This varies depending on the organism and the immediate needs of the plant.
The pentose cycle is also called the Calvin-Benson cycle, in honor of U.S. scientists Melvin Calvin sgm and Andy Benson, who were the first to explain the main reactions of the cycle.
Administration Arts Astronomy Biographies Biology Science News Curiosities law Diseases Drugs Economy Education Spanish Sports Physical sgm Geography History Philosophy Languages Computer English Literature Mathematics Medicine Mythology Jobs Politics Portuguese Psychology Religion Sexuality Sociology Writing Chemical Society
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