Multiple Choice
Where does the Calvin cycle take place in plant cells?
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9. Photosynthesis
Calvin Cycle
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The Calvin cycle requires all of the following except:
A
O$_2$
B
CO$_2$
C
ATP
D
NADPH
Verified step by step guidance1
Step 1: Begin by understanding the Calvin cycle, which is the light-independent reaction of photosynthesis. It occurs in the stroma of chloroplasts and is responsible for synthesizing glucose from carbon dioxide (CO$_2$).
Step 2: Identify the key molecules required for the Calvin cycle. These include CO$_2$, ATP, and NADPH. CO$_2$ is the carbon source, ATP provides energy, and NADPH supplies reducing power (electrons).
Step 3: Recognize that O$_2$ is not involved in the Calvin cycle. O$_2$ is a byproduct of the light-dependent reactions of photosynthesis, but it does not play a role in the Calvin cycle.
Step 4: Compare the listed options (O$_2$, CO$_2$, ATP, NADPH) to the requirements of the Calvin cycle. Eliminate O$_2$ as it is not necessary for the cycle's processes.
Step 5: Conclude that the correct answer is O$_2$, as it is the molecule not required for the Calvin cycle.
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