Multiple Choice
What are the two main reactants in the process of photosynthesis?
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Intro to Organic Chemistry
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In the context of organic chemistry, what is the first step of the Calvin cycle?
A
Regeneration of ribulose bisphosphate
B
Reduction of 3-phosphoglycerate
C
Carbon fixation
D
Formation of glucose
Verified step by step guidance1
The Calvin cycle is a series of biochemical reactions that occur in the stroma of chloroplasts in photosynthetic organisms. It is part of the process of photosynthesis and is crucial for the fixation of carbon dioxide into organic molecules.
The first step of the Calvin cycle is carbon fixation. This involves the incorporation of carbon dioxide into an organic molecule.
During carbon fixation, carbon dioxide (
) is attached to a five-carbon sugar called ribulose bisphosphate (RuBP).
The enzyme responsible for this reaction is ribulose-1,5-bisphosphate carboxylase/oxygenase, commonly known as RuBisCO. It catalyzes the reaction between RuBP and carbon dioxide to form an unstable six-carbon intermediate.
This unstable six-carbon intermediate quickly breaks down into two molecules of 3-phosphoglycerate (
), which are then used in subsequent steps of the Calvin cycle.
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