BRAINCAKEUses of Triose Phosphate
Triose phosphate (TP) is the 3-carbon product of the Calvin cycle, made when GP is reduced using ATP and reduced NADP. It is the starting point for making all the organic molecules a plant needs.
Regenerating RuBP. Most TP is recycled. Of every six molecules of TP made, five are used to regenerate three molecules of RuBP, using ATP. Only one in six leaves the cycle to be used elsewhere.
Worked example: fixing 6 molecules of CO2 makes 12 GP and so 12 TP. Ten TP regenerate 6 RuBP, leaving 2 TP (6 carbons), enough for one molecule of glucose.
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Key terms in this lesson
- acetyl coenzyme a
- A 2-carbon compound formed from acetate and coenzyme A that enters the Krebs cycle to be oxidised for ATP production.
- rubp
- A 5-carbon compound in the Calvin cycle that combines with carbon dioxide, catalysed by RuBisCO, to form two molecules of GP.
More in Energy for Biological Processes
- Limiting Factors of Photosynthesis
- Light Intensity as a Limiting Factor
- Carbon Dioxide Concentration as a Limiting Factor
- Temperature as a Limiting Factor
- Interpreting Limiting Factor Graphs
- Effect of Limiting Factors on the Calvin Cycle
- Investigating the Rate of Photosynthesis
- Agricultural Glasshouses and Limiting Factors
All 17 lessons in Energy for Biological Processes · All OCR A-level Biology topics