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CAIE A-Level Biology 13.1.9 Non-Cyclic Photophosphorylation

Practise tracing electrons from PSII through carriers and PSI to NADP, including photolysis, proton pumping, oxygen release, ATP and reduced NADP formation.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • trace electrons from photosystem II through carriers to photosystem I and NADP
  • use photolysis of water to replace PSII electrons and produce protons and oxygen
  • account for ATP by chemiosmosis and reduced NADP after electron re-excitation

13.1.9—Non-cyclic photophosphorylation question 1

[Maximum number: 4]

Non-cyclic photophosphorylation occurs in the light-dependent stage of photosynthesis.
Outline the main features of non-cyclic photophosphorylation.

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