“Calvin cycle or C3 cycle is defined as a set of chemical reactions performed by the plants to reduce carbon dioxide and other compounds into glucose.” What is Calvin Cycle? carbon dioxide molecules are bonded together with the electrons and H's from NADPH to form glucose. This reaction, involving the enzyme rubisco (the most abundant protein on Earth), results in a 6-carbon compound that is very unstable and is rapidly split into two, 3-carbon molecules. How the products of the light reactions, ATP and NADPH, are used to fix carbon into sugars in the second stage of photosynthesis. What two products of the light reactions are used up in the Calvin cycle? What happens to carbon dioxide molecules in the Calvin cycle reactions? The Calvin Cycle. These reactions actually have several names associated with them. - The six G3P molecules produced contain 18 carbons, a net gain of three carbons from CO2. The Calvin cycle refers to the chemical reactions that take place in a plant overnight. This produces an unstable six carbon molecule that immediately splits into two molecules of PGA (3 carbon acid phosphoglyceric acid) Read This! The Calvin cycle is the term used for the reactions of photosynthesis that use the energy stored by the light-dependent reactions to form glucose and other carbohydrate molecules. Calvin Cycle Definition. • For every three CO2 molecules that enter the Calvin cycle, six G3P molecules are produced, only one of which can be counted as net gain. ATP and NADPH. f. What happens to the PGAL molecule that does not continue on in the Calvin cycle? The Calvin cycle is the cycle of chemical reactions performed by plants to “fix” carbon from CO 2 into three-carbon sugars.. Later, plants and animals can turn these three-carbon compounds into amino acids, nucleotides, and more complex sugars such as starches.. - The cycle begins with three five-carbon RuBP molecules – a total of 15 carbons. Carbon dioxide enters the Calvin cycle by being added to the 5-carbon compound called ribulose bisphosphate (RuBP). In plants, carbon dioxide (CO 2) enters the leaves through stomata, where it diffuses over short distances through intercellular spaces until it reaches the mesophyll cells.Once in the mesophyll cells, CO 2 diffuses into the stroma of the chloroplast, the site of light-independent reactions of photosynthesis. In order to continue running the Calvin cycle, and the reason that it is a cycle rather than just a process, the Rubisco must be recycled in order to go and pick up new carbon dioxide molecules. The carbon atoms used to build carbohydrate molecules comes from carbon dioxide, the gas that animals exhale with each breath. Calvin cycle is also known as the C3 cycle or light-independent or dark reaction of photosynthesis. This process of “carbon fixation” is how most new organic matter is created. 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