Photosynthesis Problem Set 2

Problem 6: Dark reactions

Which of the following does NOT occur during the dark reaction of photosynthesis?

A. utilization of NADPH
B. utilization of ATP
C. reduction of oxygen to produce water
The reduction of oxygen to produce water is not a feature of photosynthesis, but rather of mitochondrial respiration. The oxidation of water occurs during photosynthetic electron transport during the light reactions of photosynthesis. In the absence of a source of light energy (dark reactions have no direct requirement for light energy), oxygen is not produced.

D. synthesis of glucose
E. utilization of carbon dioxide

The Biology Project
University of Arizona
Monday, September 30, 1996
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