Multiple Choice
Why are 6 molecules of CO\(_2\) required during the Calvin cycle to produce one molecule of glucose?
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9. Photosynthesis
Calvin Cycle
Multiple Choice
Which of the following molecules are required as inputs for the Calvin cycle during photosynthesis?
A
CO\(_2\), ATP, and NADPH
B
Glucose, NADH, and CO\(_2\)
C
Pyruvate, NADPH, and O\(_2\)
D
O\(_2\), ATP, and FADH\(_2\)
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 inputs required for the Calvin cycle. These include CO\(_2\), ATP, and NADPH. CO\(_2\) provides the carbon atoms for glucose synthesis, ATP supplies energy, and NADPH provides reducing power (electrons).
Step 3: Analyze the options provided in the question. Compare each set of molecules to the known inputs of the Calvin cycle: CO\(_2\), ATP, and NADPH.
Step 4: Eliminate incorrect options by checking if they include molecules not involved in the Calvin cycle. For example, glucose is a product, not an input; NADH and FADH\(_2\) are used in cellular respiration, not photosynthesis; pyruvate is part of glycolysis, and O\(_2\) is involved in the electron transport chain, not the Calvin cycle.
Step 5: Select the correct answer, which is the option containing CO\(_2\), ATP, and NADPH, as these are the required inputs for the Calvin cycle during photosynthesis.
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