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C1.3.17 (HL)—RuBP regeneration

RuBP regeneration keeps the Calvin cycle running by rebuilding the carbon dioxide acceptor from triose phosphate using ATP, connecting the mechanism to observable photosynthesis evidence.

Syllabus
First assessment 2025
Objective
C1.3.17
Level
HL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper1A
Typical marks1

Recent exam appearances

May 2025Paper1A ["HL"] · TZ28[ 1 ]C1.3.17 (HL)—RuBP regeneration
Practice this objective

Coverage 2025–2025 · Updated 15 Jul 2026

Concept essentials

  • RuBP is the carbon dioxide acceptor in the Calvin cycle.
  • RuBP must be regenerated after carbon fixation.
  • ATP is used during regeneration of RuBP.
  • Six RuBP molecules are regenerated during the fixation sequence that yields one glucose.
ConceptIB Biology HL