IB Biology HL C1.2.13 Hl Electron Transport Chain Questions
Practise IB Biology HL 1.2.13 by applying electron transport chain concepts to exam questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Locate the electron transport chain in the inner mitochondrial membrane and distinguish it from glycolysis in the cytoplasm.
- Explain that electron transfer releases energy used to pump protons across the inner mitochondrial membrane.
- Relate the proton gradient and chemiosmosis to ATP generation during aerobic respiration.
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IB Biology HL C1.2.13 Hl Electron Transport Chain Questions question 1
[Maximum number: 7]
Explain the role of the electron transport chain in the generation of ATP by cell respiration.
electron transport chain performs chemiosmosis / chemiosmosis generates ATP;
receives energy/electrons from oxidation reactions/from Krebs cycle/glycolysis;
receives electrons from reduced NAD/NADH/reduced FAD/FADH;
energy released as electrons pass from carrier to carrier (in the chain);
release of energy (from electron flow) coupled to proton pumping;
protons pumped into intermembrane space;
creates proton gradient;
protons diffuse back/move down the concentration gradient (across membrane);
protons pass through ATP synthase;
protons return to the matrix;
flow of protons provides energy for generating ATP;
electrons transferred to oxygen at end of electron transport chain;
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