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C1.2.13 (HL)—Electron transport chain

The electron transport chain is located on the inner mitochondrial membrane, where reduced carriers donate electrons to membrane carriers, supporting usable cellular work and measurable biological activity.

Syllabus
First assessment 2025
Objective
C1.2.13
Level
HL

Concept essentials

  • The electron transport chain is on the inner mitochondrial membrane.
  • Cristae provide membrane surface for electron transport.
  • Reduced NAD and FAD donate electrons to the chain.
  • Electron transfers release energy for later proton pumping.
ConceptIB Biology HL