The Electron Transport System also called the Electron Transport Chain, is a chain of reactions that converts redox energy available from oxidation of NADH and FADH2, into proton-motive force which is used to synthesize ATP through conformational changes in the ATP synthase complex through a process called oxidative phosphorylation. Show
Electron Transport Chain Location
Electron Transport Chain Components/ Electron carriers
a. FMN (Flavin Mononucleotide)
NAD + H+ + FMN → NAD + FMNH2
b. Ubiquinone (Co-enzyme-Q)
FMNH2 + UQ → FMN + UQH2 c. Cytochromes
Electron Transport Chain EquationThe electron transport chain consists of a series of oxidation-reduction reactions that lead to the release of energy. A summary of the reactions in the electron transport chain is: NADH + 1/2O2 + H+ + ADP + Pi → NAD+ + ATP + H2O Electron Transport Chain ComplexesA chain of four enzyme complexes is present in the electron transport chain that catalyzes the transfer of electrons through different electron carriers to the molecular oxygen. a. Complex I (Mitochondrial complex I)
NADH + H+ + CoQ → NAD+ + CoQH2
b. Complex II (Mitochondrial complex II)
Succinate + FADH2 + CoQ → Fumarate + FAD+ + CoQH2 c. Complex III (Mitochondrial complex III)
CoQH2 + 2 cytc c (Fe3+) → CoQ + 2 cytc c (Fe2+) + 4H+ d. Complex IV (Mitochondrial complex IV)
4 cytc c (Fe 2+) + O2 → 4cytc c (Fe3+) + H2O Figure: Electron Transport Chain. Image created with biorender.com Electron Transport Chain StepsThe following steps are involved in electron transfer chains which involve the movement of electrons from NADH to molecular oxygen: What are the steps of the electron transport chain?Step 1: Generating a Proton Motive Force.. Step Two: ATP Synthesis via Chemiosmosis.. Step Three: Reduction of Oxygen.. Summary: Oxidative Phosphorylation.. What happens at the first step of the electron transport chain?During the first step, a pair of electrons from are transferred to the electron carrier coenzyme Q by NADH dehydrogenase (site 1 and Q in Figure 8.26), and using the energy released, a pair of hydrogen ions are pumped into the intermembrane space.
What are the 4 steps of the electron transport chain quizlet?1st step. electrons are removed from NADH and FADH2.. 2nd step. hydrogen ions are transported across membrane.. 3rd step. ADP changed to ATP when hydrogen ions flow through ATP synthase.. 4th step. water formed when oxygen picks up electrons and H+ ions.. What is the order of electron transport?The associated electron transport chain is NADH → Complex I → Q → Complex III → cytochrome c → Complex IV → O2 where Complexes I, III and IV are proton pumps, while Q and cytochrome c are mobile electron carriers. The electron acceptor for this process is molecular oxygen.
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