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zcaballero zcaballero
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6 years ago
If you add a compound to illuminated chloroplasts that inhibits the NADP+ reductase, NADPH generation ceases, as expected.
 
  However, ferredoxin does not accumulate in the reduced form because it is able to donate its electrons not only to NADP+ (via NADP+ reductase) but also back to the cytochrome b6-f complex. Thus, in the presence of the compound, a cyclic form of photosynthesis occurs in which electrons flow in a circle from ferredoxin, to the cytochrome b6-f complex, to plastocyanin, to photosystem I, to ferredoxin. What will happen if you now also inhibit photosystem II?
  (a) Less ATP will be generated per photon absorbed.
  (b) ATP synthesis will cease.
  (c) Plastoquinone will accumulate in the oxidized form.
  (d) Plastocyanin will accumulate in the oxidized form.
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sophiamendoza94sophiamendoza94
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