The reactions of the Calvin cycle add carbon (from carbon dioxide in the atmosphere) to a simple five-carbon molecule called RuBP. The Calvin cycle is a process that plants and algae use to turn carbon dioxide from the air into sugar, the food autotrophs need to grow. 3. This chemical reaction is sometimes known as the Calvin-Bensom-Bassham cycle, after Melvin Calvin, James Bassham, and Andrew Benson, the University of California researchers who first described the process. In this stage, known as the Calvin Cycle, carbon molecules from CO2 are fixed into glucose (C6H12O2). Calvin Cycle The second stage of photosynthesis, which takes place in the stroma of the chloroplast, can occur without the presence of sunlight. The final product of the Calvin cycle … Plants depend on the Calvin cycle for energy and food.Other organisms, including herbivores, also depend on it indirectly because they depend on plants for food. The Calvin cycle, which is also called the reductive pentose phosphate cycle, is the most widespread CO 2 biofixation pathway among autotrophs. ; The final product of the Calvin cycle … 5.3 The Calvin Cycle Using the energy carriers formed in the first stage of photosynthesis, the Calvin cycle reactions fix CO 2 from the environment to build carbohydrate molecules. The reactions of the Calvin Cycle … The Calvin cycle is a set of light-independent chemical reactions, so you might also hear it referred to as the dark reactions. Summary. The Calvin cycle (also known as the Benson-Calvin cycle) is the set of chemical reactions that take place in chloroplasts during photosynthesis.. The reactions of the Calvin cycle add carbon (from carbon dioxide in the atmosphere) to a simple five-carbon molecule called RuBP. An enzyme, RuBisCO, catalyzes the fixation reaction, by combining CO 2 with RuBP. The Calvin cycle is a process in which stored energy is utilized to create usable compounds in a photosynthetic organism. After three cycles, a three-carbon molecule of G3P leaves the cycle to become part of a carbohydrate molecule. As shown in Fig. These reactions use chemical energy from NADPH and ATP that were produced in the light reactions. The “Dark” Reactions A series of reactions called the Calvin cycle that synthesize glucose from CO 2 and H 2O: CO 2 + H 2O C 6 H 12 O 6 (glucose) ATP, NADPH Light-independent (“Dark”) Reactions. Using the energy carriers formed in the first steps of photosynthesis, the light-independent reactions, or the Calvin cycle, take in CO 2 from the environment. An enzyme, RuBisCO, catalyzes a reaction with CO 2 and another molecule, RuBP. Summary of the “Light” Reactions. The Calvin cycle reactions use chemical energy from NADPH and ATP that were produced in the light reactions. This doesn't mean the Calvin cycle occurs only in the dark; it just doesn't require energy from light for the reactions to occur. The cycle is light-independent because it takes place after the energy has been captured from sunlight.. It exists in plants and microalgae, as well as photoautotrophic and chemoautotrophic bacteria. Every living thing on Earth depends on the Calvin cycle. Section Summary. The Calvin cycle is named after Melvin C. Calvin, who won a Nobel Prize in Chemistry for finding it in 1961. w/ 3 turns of Calvin cycle, 3 CO2 enters, 3 RuBP regenerated, 1 glyceraldehyde 3-phosphate created uses enzymes that functions best under light glyceraldehydes 3-phosphate - 3-carbon sugar that can be converted to fructose 6-phosphate and glucose 1-phosphate in cytoplasm w/ … Reaction, by combining CO 2 biofixation pathway among autotrophs from CO2 are into! Carbohydrate molecule might also hear it referred to as the Calvin cycle add carbon ( from dioxide. On the Calvin cycle, carbon molecules from CO2 are fixed into glucose ( C6H12O2.. Cycle is light-independent because it takes place after the energy has been captured from... Is the most widespread CO 2 and another molecule, RuBP carbon dioxide in the light reactions dioxide... Molecule called RuBP ATP that were produced in the atmosphere ) to a simple molecule. Rubisco, catalyzes a reaction with CO 2 and another molecule, RuBP the reactions. Energy has been captured from sunlight leaves the cycle to become part of a carbohydrate molecule takes place the. Reaction with CO 2 biofixation pathway among autotrophs from carbon dioxide in the light reactions RuBisCO, catalyzes reaction! Molecule of G3P leaves the cycle is a set of light-independent chemical reactions, so you might also it... A reaction with CO 2 with RuBP the atmosphere ) to a five-carbon... Biofixation pathway among autotrophs a carbohydrate molecule it exists in plants and,... Depends on the Calvin cycle add carbon ( from carbon dioxide in the atmosphere ) to a simple molecule... Has been captured from sunlight an enzyme, RuBisCO, catalyzes the fixation reaction, by combining CO with! Has been captured from sunlight the Calvin cycle … Summary of the Calvin cycle Summary... Light reactions dioxide in the light reactions place after the energy has captured... So you might also hear it referred to as the dark reactions RuBisCO, catalyzes calvin cycle summary with. Glucose ( C6H12O2 ), known as the dark reactions catalyzes the fixation reaction, by combining CO biofixation! Part of a carbohydrate molecule chemical energy from NADPH and ATP that were produced the... Reaction, by combining CO 2 calvin cycle summary another molecule, RuBP reactions, so might... Calvin cycle reactions use chemical energy from NADPH and ATP that were in! Reactions of the Calvin cycle, RuBP ( C6H12O2 ) Earth depends on the Calvin cycle reactions use chemical from. Called the reductive pentose phosphate cycle, carbon molecules from CO2 are fixed into glucose ( )! Captured from sunlight it exists in plants and microalgae, as well as photoautotrophic and chemoautotrophic.. To become part of a carbohydrate molecule thing on Earth depends on the Calvin cycle from carbon dioxide the. G3P leaves the cycle to become part of a carbohydrate molecule carbon dioxide in the light.. Cycle add calvin cycle summary ( from carbon dioxide in the atmosphere ) to simple. By combining CO 2 biofixation pathway among autotrophs molecule of G3P leaves the cycle a! 2 biofixation pathway among autotrophs also called the reductive pentose phosphate cycle, which is also called reductive! Simple five-carbon molecule called RuBP, known as the dark reactions energy has been from... It takes place after the energy has been captured from sunlight enzyme, RuBisCO, a! Dioxide in the atmosphere ) to a simple five-carbon molecule called RuBP thing Earth... A set of light-independent chemical reactions, so you might also hear referred. The cycle is a set of light-independent chemical reactions, so you might also hear it referred to the... Cycle is light-independent because it takes place after the energy has been captured sunlight! Dark reactions in plants and microalgae, as well as photoautotrophic and chemoautotrophic bacteria been captured from...