Unlike the light reactions, which take place in the thylakoid membrane, the reactions of the Calvin cycle take place in the stroma (the inner space of chloroplasts). This illustration shows that ATP and NADPH produced in the light reactions are used in the Calvin cycle to make sugar.... read more ›
ATP and NADPH use their stored energy to convert the three-carbon compound, 3-PGA, into another three-carbon compound called G3P. This type of reaction is called a reduction reaction, because it involves the gain of electrons. A reduction is the gain of an electron by an atom or molecule.... see more ›
In fixation, the first stage of the Calvin cycle, light-independent reactions are initiated; CO2 is fixed from an inorganic to an organic molecule. In the second stage, ATP and NADPH are used to reduce 3-PGA into G3P; then ATP and NADPH are converted to ADP and NADP+, respectively.... continue reading ›
ATP and NADPH produced by the light-dependent reactions of the photosystems are used by the Calvin cycle in the stroma of the chloroplast.... read more ›
Unlike the light reactions, which take place in the thylakoid membrane, the reactions of the Calvin cycle take place in the stroma (the inner space of chloroplasts). This illustration shows that ATP and NADPH produced in the light reactions are used in the Calvin cycle to make sugar.... continue reading ›
- Carbon Fixation - CO2 is broken down to form 3-PGA.
- Reduction - 3-PGA is converted to 3-PGA and reacts with ATP and NADPH.
- Release of on G3P to make carbs.
- Repeat iwth RuBP.
ATP consists of an adenosine molecule bonded to three phosphate groups in a row. During cellular respiration, energy in food is converted into chemical energy that can be used by cells. This chemical energy is stored in the pyrophosphate bond, which lies between the last two phosphate groups of ATP.... view details ›
In a process called non-cyclic photophosphorylation (the "standard" form of the light-dependent reactions), electrons are removed from water and passed through PSII and PSI before ending up in NADPH. This process requires light to be absorbed twice, once in each photosystem, and it makes ATP .... continue reading ›
In summary, it takes six turns of the Calvin cycle to fix six carbon atoms from CO2. These six turns require energy input from 12 ATP molecules and 12 NADPH molecules in the reduction step and 6 ATP molecules in the regeneration step.... continue reading ›
The energy used in the Calvin cycle is supplied by ATP and NADPH that are produced in the first stage (light reactions) of photosynthesis.... read more ›
Photosynthesis occurs in two stages- light reaction and dark reaction. In light reaction ATP and reduced coenzymes NADPH2 are synthesized, which are used in dark reaction to produce sugars. 3 ATP molecules and 2 NADPH2 molecules are required to fix one molecule of carbon dioxide in Calvin cycle.... read more ›