http://www.botany.com/index.16.htm. Chapter 6. Photosynthesis. Section 1 Vocabulary Pretest. Autotroph Photosynthesis Heterotroph Light Reactions Chloroplasts Thylakoid Stroma. Cellular organelles where photosynthesis occurs The first stage of photosynthesis
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6CO2 + 6H2O C6H12O6 + 6O2
The Reactants are carbon dioxide and water
The Products are glucose and oxygen
At the same time that light is absorbed by photosystem II, it is also being absorbed by photosystem I, again, exciting electrons.
Photosystem II replaces its electrons by splitting water, using a water-splitting enzyme.
2H2O 4H+ + 4e- + O2
The build up of H+in the thylakoid space stores potential energy. This energy is harvested by an enzyme called ATP synthase.
3 molecules of CO2
6 molecules of 3-PGA
Plant species that fix carbon using the Calvin Cycle only are known as C3 plants because of the three-carbon compound that is initially formed in the process. They include most plants.