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Multiple Choice
Which of the following molecules is the primary reducing agent in the Calvin cycle reactions?
A
ATP
B
NADPH
C
NADH
D
FADH2
Verified step by step guidance
1
Understand the role of reducing agents in biochemical cycles. Reducing agents donate electrons to other molecules, facilitating reduction reactions.
Identify the Calvin cycle as a series of biochemical reactions that occur in the chloroplasts of photosynthetic organisms. It is crucial for the synthesis of glucose from carbon dioxide and water.
Recognize that the Calvin cycle requires reducing power to convert 3-phosphoglycerate into glyceraldehyde-3-phosphate, a key step in the cycle.
Recall that NADPH is a common reducing agent in photosynthesis, providing the necessary electrons for the reduction reactions in the Calvin cycle.
Compare the options: ATP is an energy carrier, NADH and FADH2 are reducing agents in cellular respiration, while NADPH is specifically used in the Calvin cycle as the primary reducing agent.