Multiple Choice
Which compound provides the reducing power for the Calvin cycle reactions?
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9. Photosynthesis
Calvin Cycle
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Which of the following best describes the primary function of the Calvin cycle in photosynthesis?
A
It splits water molecules to release oxygen.
B
It absorbs light energy to excite electrons in chlorophyll.
C
It converts carbon dioxide into glucose using ATP and NADPH.
D
It generates ATP through oxidative phosphorylation.
Verified step by step guidance1
Step 1: Begin by understanding the context of the Calvin cycle, which is part of photosynthesis. Photosynthesis occurs in two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). The Calvin cycle is also known as the dark reactions because it does not directly require light.
Step 2: Recall that the Calvin cycle takes place in the stroma of the chloroplast and uses ATP and NADPH produced during the light-dependent reactions. These molecules provide the energy and reducing power needed for the cycle.
Step 3: Understand the primary function of the Calvin cycle. Its main role is to fix carbon dioxide (CO₂) from the atmosphere into organic molecules. This process is called carbon fixation, and it ultimately leads to the production of glucose, a sugar molecule.
Step 4: Clarify that the Calvin cycle does not involve splitting water molecules (this occurs in the light-dependent reactions), absorbing light energy (also part of the light-dependent reactions), or generating ATP through oxidative phosphorylation (a process that occurs in cellular respiration, not photosynthesis).
Step 5: Conclude that the correct description of the Calvin cycle's primary function is: 'It converts carbon dioxide into glucose using ATP and NADPH.' This highlights its role in synthesizing organic molecules essential for plant growth and energy storage.
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