Answer :
Final answer:
The metabolic intermediate of the light-independent reactions in photosynthesis is ribulose bisphosphate (RuBP). It is essential for the Calvin cycle to function as it reacts with carbon dioxide. Other compounds like ATP and NADPH support the cycle but do not serve as intermediates.
Explanation:
Metabolic Intermediates in Photosynthesis
During the light-independent reactions, also known as the Calvin cycle, several compounds play important roles as metabolic intermediates. One key compound that must continuously enter this cycle is ribulose bisphosphate (RuBP). RuBP combines with carbon dioxide (CO₂) through the action of the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO), initiating the cycle of reactions that leads to the formation of carbohydrates.
In contrast, while ATP and NADPH are critical products generated during the light-dependent reactions and provide energy and reducing power, they do not directly participate as intermediates once the Calvin cycle is underway. Instead, their role is to furnish the energy required for the conversion processes in the cycle.
Another compound mentioned, 3-phosphoglycerate (3-PGA), is a product formed in the Calvin cycle but is not a compound that continually enters the cycle.
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