Answer :
Final answer:
The metabolic intermediate of the light-independent reactions in photosynthesis is PGA (3-phosphoglycerate). While ATP and NADPH provide the necessary energy and reducing power, RuBP is also essential but does not serve as a metabolic intermediate. PGA is formed during the Calvin cycle and is subsequently converted into G3P.
Explanation:
Metabolic Intermediates in Light-Independent Reactions
The light-independent reactions of photosynthesis, commonly known as the Calvin cycle, utilize various metabolic intermediates. Among the options listed: ATP and NADPH are products from the light-dependent reactions and are crucial for the energy and reducing power required in the Calvin cycle.
However, the compound that serves as a direct metabolic intermediate during the light-independent reactions is PGA (3-phosphoglycerate). This compound is formed during the initial phase of the Calvin cycle when carbon dioxide is fixed. Subsequently, PGA is converted into glyceraldehyde-3-phosphate (G3P) with the help of ATP and NADPH.
On the other hand, RuBP (ribulose bisphosphate) is another important molecule that must continuously enter the cycle, but it is not a metabolic intermediate; instead, it is a reactant that regenerates.
Key Points:
- PGA is a crucial metabolic intermediate in the Calvin cycle.
- ATP and NADPH are utilized in the conversion of PGA to G3P.
- RuBP is essential for the cycle but is not a product formed during the reactions.
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