Multiple Choice
The reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night. Why?
9. Photosynthesis
Calvin Cycle
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Which of the following occurs during the Calvin cycle?
A
Light energy is converted to chemical energy.
B
ATP is oxidized, and NADPH is reduced.
C
ATP is reduced, and NADPH is oxidized.
D
Linear electron flow produces the materials required for the fixation of carbon from carbon dioxide.
E
ATP is hydrolyzed, and NADPH is oxidized.
Verified step by step guidance1
Understand that the Calvin cycle is a part of photosynthesis that occurs in the stroma of chloroplasts and does not directly require light, hence it is also known as the light-independent reactions.
Recognize that the main purpose of the Calvin cycle is to convert carbon dioxide and other compounds into glucose. This process requires energy, which is provided by ATP and NADPH produced during the light-dependent reactions.
Identify that during the Calvin cycle, ATP is used as an energy source and is hydrolyzed to ADP and inorganic phosphate. This process releases energy that is used to drive the reactions of the cycle.
Understand that NADPH acts as a reducing agent in the Calvin cycle, providing the high-energy electrons needed to reduce carbon dioxide into glucose. During this process, NADPH is oxidized to NADP+.
Conclude that the correct statement about the Calvin cycle is that ATP is hydrolyzed, and NADPH is oxidized, as these processes provide the necessary energy and reducing power for carbon fixation.
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