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Multiple Choice
In the Calvin cycle, which molecule is produced and later converted into glucose?
A
Ribulose bisphosphate (RuBP)
B
3-Phosphoglycerate (3-PGA)
C
Fructose-6-phosphate
D
Glyceraldehyde-3-phosphate (G3P)
Verified step by step guidance
1
Understand the Calvin cycle: The Calvin cycle is a series of biochemical reactions that occur in the stroma of chloroplasts in photosynthetic organisms. It is part of the light-independent reactions of photosynthesis, where carbon dioxide is fixed into organic molecules.
Identify the key molecules involved: The cycle begins with the fixation of carbon dioxide into ribulose bisphosphate (RuBP), which is then converted into 3-phosphoglycerate (3-PGA) through a series of reactions.
Recognize the role of Glyceraldehyde-3-phosphate (G3P): During the Calvin cycle, 3-PGA is reduced to G3P using ATP and NADPH produced in the light-dependent reactions. G3P is a crucial intermediate that can be used to form glucose and other carbohydrates.
Understand the conversion process: G3P can be converted into glucose through a series of enzymatic reactions. Multiple G3P molecules are combined to form fructose-6-phosphate, which can then be converted into glucose.
Summarize the cycle's output: The Calvin cycle ultimately produces G3P, which serves as the building block for glucose synthesis. This process is essential for the storage of energy in the form of carbohydrates in plants.