Some sources say : One cycle = consumption of 3 CO2 Some other sources say : One cycle = consumption of 1 CO2 [This is the more frequent definition] Anyway, the important point is that for one molecule of glucose [or 2 molecules of G3p], 6 CO2, 18 ATP, and 12 NADPH are used. Cellular respiration has four stages: … Thus, for one molecule of glucose, the Krebs cycle produces a grand total of 4 molecules of carbon dioxide, 2 molecules of ATP/GTP, 6 NADH, and 2 FADH 2. The carbon atoms used to build carbohydrate molecules comes from carbon dioxide, the gas that animals exhale with each breath. The Calvin cycle uses CO2 that has entered the chloroplast to produce glucose, which leaves the chloroplast, and releases ADP and NADP+ In this step, the plant uses the energy from ATP and the electron rom NADPH to build sugars out of CO2.. Later, it leads to produce hexose sugars in the mitochondria. Glucose reacts with oxygen during a process called cellular respiration, which takes place inside the mitochondria of a cell. The reaction of oxygen and glucose produces energy and carbon dioxide. But you already knew that ! The light reactions, which take place in the thylakoid membranes, convert light energy to the chemical energy of ATP and NADPH. Carbohydrate and water are also both by-products of the reaction. Now that we have an overview of the cycle, let’s look a bit more in depth so that we can account for the reactant/products are each major step on the loop. 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 … Describe the relationship between the light and the Calvin cycle. The Krebs Cycle, also called the citric acid cycle, is the second major step in oxidative phosphorylation.After glycolysis breaks glucose into smaller 3-carbon molecules, the Krebs cycle transfers the energy from these molecules to electron carriers, which will be used in the electron transport chain to produce ATP. For the net synthesis of one G3P molecule, the Calvin cycle uses the products of the light reactions: - 9 ATP molecules - 6 NADPH molecules G3P produced by the Calvin cycle is the raw material used to synthesize glucose and other carbohydrates. • The Calvin cycle uses 18 ATP and 12 NADPH molecules to produce one glucose molecule. However, the produced carbohydrates in the Calvin cycle are not hexose sugars (glucose with six carbons) according to the latest discoveries; they are triose (three-carbon) sugar phosphates, aka triose phosphates. Krebs Cycle Definition. ADVERTISEMENT. Some energy released is in the form of heat which maintains human body temperature. Six carbon dioxide molecules (CO2) are required to create one glucose molecule (C6H12O6) because carbon dioxide has one carbon per molecule, while glucose molecules have six carbons. Overall, this cycle is an anabolic pathway, which forms glucose from carbon dioxide and water. Steps Of The Krebs Cycle.