Photosynthesis Problem Set 2

Problem 7 Tutorial: Products of the dark reactions.

Which of the following would you expect to see as products of the dark reaction of photosynthesis?

A. carbon dioxide, NADPH and ATP
B. NADPH, P_i and ATP
C. carbon dioxide, ATP and glucose
D. glucose, NADP⁺ and ADP
E. water, carbon dioxide and light

Calvin-Benson cycle

To review the overall events that occur during the dark reactions of photosynthesis, also known as the Calvin-Benson cycle, please review the tutorial to question 6. A summary equation for this cycle, which shows both the reactants and products of the pathway, is as follows:

Products of the dark reactions

1.	Glucose, C₆H₁₂O₆. The carbon atoms of glucose come from CO₂.
2.	NADP⁺. This is the oxidized form of the electron carrier NADPH which is a reactant in the cycle.
3.	ADP. The hydrolysis of ATP to ADP and P_i is a source of energy for carbohydrate biosynthesis.

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University of Arizona
Thursday, October 3, 1996
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