Photosynthesis Problem Set 2
Problem 6 Tutorial: Dark reactions
Which of the following does NOT occur during the dark reaction of photosynthesis?
utilization of NADPH
utilization of ATP
reduction of oxygen to produce water
synthesis of glucose
utilization of carbon dioxide
Dark reactions of photosynthesis
The "dark reactions" of photosynthesis refer to the carbohydrate biosynthesis reactions that occur in the chloroplast stroma. These reactions are catalyzed by a series of soluble enzymes, known collectively as "The Calvin-Benson Cycle". Carbohydrate biosynthesis can occur in the absence of photosynthetic electron transport. A summary of the events that occur during the dark reactions of photosynthesis is given by the summary equation:
Major components of this equation
This overall equation can be broken down into three major components:
What does not occur during the dark reaction? The reduction of oxygen to produce water, which is actually an event that occurs in the mitochondrial respiratory pathway.
The Biology Project
University of Arizona
Thursday, October 3, 1996
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