The Biology Project: Biochemistry

Photosynthesis Problem Set 1

Problem 3: Overall redox reaction

Correct!

During noncyclic photophosphorylation, water is oxidized and the electrons from water pass through photosystem II and photosystem I before reducing:
A carbon dioxide

B NADP+

Each step in this pathway is a coupled oxidation-reduction reaction. Water is oxidized as a result of the light reaction of Photosystem II. From Photosystem II, electrons pass to plastoquinone to cytochromes to plastocyanin. Another light reaction at Photosystem I activates electrons for transfer to ferredoxin, and finally to NADP+.

C plastoquinones

D FAD

E ribulose 1,5-bisphosphate

The Biology Project
University of Arizona
Thursday, October 3, 1996
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