Trace reduced NAD and FAD electron donation through inner-membrane carriers, coenzyme reoxidation and proton-gradient-driven ATP synthesis by chemiosmosis in IB Biology HL C1.2.13.
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;