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| Description: The sketch shows a cross-section of a chloroplast with the light-independent reactions cycling in the stroma. The steps shown are a summary of six cycles of the Calvin–Benson reactions. Black balls signify carbon atoms. Appendix V details the reaction steps. 1 Six CO2 diffuse into a photosynthetic cell, and then into a chloroplast. Rubisco attaches each to a RuBP molecule. The resulting intermediates split, so twelve molecules of PGA form. 2 Each PGA molecule gets a phosphate group from ATP, plus hydrogen and electrons from NADPH. Twelve PGAL form. 3 Two PGAL combine to form one glucose molecule. 4 The remaining ten PGAL receive phosphate groups from ATP. The transfer primes them for endergonic reactions that regenerate the 6 RuBP. Picture Stats: Views: 39 Filesize: 95.63kB Height: 744 Width: 939 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=49479 |