The components of its electron transport chain differ from those found in mitochondria. These components and their standard reduction potentials are listed in the table below. In the table below identify the order of electron carriers in the electron transport chain. Oxidized form | Reduced form | Electrons? | E?? (V) | Order? NAD? | NADH | 2 | - 0.32 | 2 FPbOx | FPbRed | 2 | -0.62 | 2 cyt c (Fe??) | cyt c (Fe?) | 1 | + 0.22 | 1 Fe-S POx | Fe-S PRed | 2 | + 0.89 | 2 FPaOx | FPaRed | 2 | + 0.77 | 2 ?: number of electrons donated during the reaction ?: Sequence of the carriers in the electron transport chain
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NADH has a higher reduction potential than NAD+, so it will donate electrons to the next carrier in the chain. Show more…
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The components of its electron transport chain differ from those found in mitochondria. These components and their standard reduction potentials are listed in the table below. In the table below identify the order of electron carriers in the electron transport chain.
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The sequence of events in electron transport was elucidated in part by the use of inhibitors that block electron transfer at specific points along the chain. For example, adding rotenone (a plant toxin) or amytal (a barbiturate) blocks electron transport in Complex I; antimycin A (an antibiotic) blocks oxidation of Q in Complex III; and cyanide (CN-) blocks electron transport in Complex IV by binding to the Fe2+ in the Fe-Cu binuclear center. What happens to oxygen consumption when these inhibitors are added to a suspension of respiring mitochondria? What is the redox state (oxidized or reduced) of the electron carriers in the electron transport chain when each of the inhibitors is added separately to the mitochondrial suspension?
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