Chapter 10 - Chapter 10: Photosynthesis Nutritional...

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Chapter 10: Photosynthesis Nutritional Categories autotroph: synthesizes its own food  photoautotroph: synthesizes its food from sunlight and carbon dioxide heterotroph: obtains its food from other organisms  (eats other organisms) Photosynthesis: 6 CO 2    +   6 H 2 O                           C 6 H 12 O 6     +    6 O 2 Two Stages of Photosynthesis: Light Reactions vs. Dark Reactions  (Calvin cycle; carbon fixation) Light Reactions : (occur in thylakoids: in both the thylakoid space and thylakoid membranes) Solar energy absorbed by chlorophyll (chlp) splits water into hydrogen ions, excited electrons and oxygen; hydrogen ions are  pumped into the thylakoid space; electrons are transferred to NADP and H +  ions in the stroma: NADP + H + NADPH +         (oxidized)             (reduced) The pumping of hydrogen ions across the thylakoid membrane generates a chemical gradient that provides enough energy  for photophosphorylation:    proton motive force ADP + PO 4 ATP ATP synthase Oxygen (derived from water) is released as an end product 2H 2 O 4 H + + O 2 Dark Reactions (Calvin Cycle) : (occur in stroma) Carbon dioxide is incorporated into 5-C ribulose biphosphate  (C 1    +   C 5                  2C 3  )   (6 times  around produces 1 glucose (C 6 ) and regenerates ribulose biphosphate)
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Chapter 10 - Chapter 10: Photosynthesis Nutritional...

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