Triose phosphate at Higher Level: An AHL statement: where the products of the light-dependent reactions are used.
Practise this as you read
- Explain the roles of ATP and reduced NADP.
- State the product of the reduction.
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The big idea: Glycerate 3-phosphate from carbon fixation is reduced to triose phosphate (TP). Reduced NADP supplies the hydrogen and ATP supplies the energy, both made by the light-dependent reactions. Triose phosphate is the first carbohydrate made in photosynthesis.
The points to remember
- GP (3C) is reduced to triose phosphate (3C).
- Reduced NADP gives the hydrogen (reduction).
- ATP gives the energy.
- ADP + Pi and NADP return to the thylakoids to be reloaded.
- Triose phosphate is a carbohydrate, used to make glucose and other compounds.
Remember it as: GP plus H plus energy makes TP.
Real example: sugar for export. Some triose phosphate leaves the chloroplast and is made into sucrose in the cytoplasm of the leaf cell; sucrose is then carried in the phloem to the rest of the plant.
Trap: Reduced NADP is oxidised here (it gives up hydrogen); it is GP that is reduced.
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How it is asked: Expect an Explain or Outline question on the roles of ATP and reduced NADP, or a statement MCQ.
IB-style questionExplain[3 marks]
Explain how ATP and reduced NADP are used in the light-independent reactions.
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