PART ONE: Mitochondrial Electron Transport Chain Question 1 (5points): Redox act

Question

PART ONE: Mitochondrial Electron Transport Chain Question 1 (5points): Redox active species along the electron transport chain have reduction potentials between the values of the NAD+/NADH redox couple (-320 mV) and the oxygen/water redox couple (+818 mV). Electrons can thereby move down the energy scale toward progressively more positive reduction potentials! CalculateE"and the free energy change Go, for the final outcome of the NADH re-oxidation via the electron transport chain. Use the following information: Overall reaction: NADH + H+ + ½ O2 NAD++ H2O Standard reduction potential for NAD+/NADH redox couple: NAD++ 2H' + 2e NADH + H. E" =-0.32 Standard reduction potential for oxygen/water redox couple ½2 + 2H' + 2e H2O E +0.816 V

Explanation / Answer

Given,

Standard Reduction Potential:

NAD+ + 2H+ + 2e- --------- NADH + H+   = -0.32 V

(1/2) O2 + 2H+ + 2e- --------- H2O = +0.82 V

Where, the change in the redox potential is,

del E0, = (Eoxidation - (- Ereduction  )

= 0.82- (-0.32)

= 1.14 V

Then, the cange in the free energy is,

del G0 = -n F(del E0,)

Where,

n = no of electrons transferred

F = Faraday constant = 9.65 X 104 C/MOL

del G0 = -220 k J

Hence the required values,

del E0, = 1.14 V

del G0 = -220 KJ

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