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Multiple Choice
In the context of organic chemistry, what is the primary function of the Calvin cycle?
A
To produce oxygen from water
B
To convert carbon dioxide into glucose
C
To break down glucose into carbon dioxide
D
To synthesize ATP from ADP and inorganic phosphate
Verified step by step guidance
1
The Calvin cycle is a series of biochemical redox reactions that take place in the stroma of chloroplasts in photosynthetic organisms.
Its primary function is to convert carbon dioxide and water into organic compounds, such as glucose, using the energy from ATP and NADPH produced in the light-dependent reactions of photosynthesis.
The cycle involves three main stages: carbon fixation, reduction phase, and regeneration of the ribulose bisphosphate (RuBP).
During carbon fixation, carbon dioxide is attached to a five-carbon sugar, ribulose bisphosphate (RuBP), resulting in a six-carbon compound that is immediately split into two molecules of 3-phosphoglycerate (3-PGA).
In the reduction phase, ATP and NADPH are used to convert 3-PGA into glyceraldehyde-3-phosphate (G3P), a three-carbon sugar, which can be used to form glucose and other carbohydrates.