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Multiple Choice
Which step is a part of the light-independent reactions in organic chemistry?
A
Photolysis of water
B
Carbon fixation
C
ATP synthesis
D
Electron transport chain
Verified step by step guidance
1
Understand that the light-independent reactions, also known as the Calvin Cycle, occur in the stroma of chloroplasts and do not require light directly.
Recognize that carbon fixation is a key step in the Calvin Cycle, where carbon dioxide is incorporated into organic molecules.
Identify that photolysis of water, ATP synthesis, and the electron transport chain are associated with the light-dependent reactions, not the light-independent reactions.
Carbon fixation involves the enzyme ribulose bisphosphate carboxylase/oxygenase (RuBisCO) catalyzing the reaction between carbon dioxide and ribulose bisphosphate (RuBP).
The product of carbon fixation is a 3-carbon compound, 3-phosphoglycerate (3-PGA), which is further processed in the Calvin Cycle to eventually form glucose.