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Exemplary Quiz

(Note: Questions in this exemplary quiz were used from a set of questions prepared by Gnaiger Erich for his presentation at MiPschool Tromso-Bergen 2018: The protonmotive force and respiratory control. 1. Coupling of electron transfer reactions to vectorial translocation of protons. 2. From Einstein’s diffusion equation on gradients to Fick’s law on compartments.

Original link here: Gnaiger 2018 MiPschool Tromso A2

(Only one correct answer)

Convert the molar format of the Gibbs force of reaction, ΔkFnO2 [kJ/mol], into the electrical format, ΔkFeO2 [V].

1 Which physicochemical constant is required?

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	The Faraday constant, F = e·NA = 96,485.33 C/mol
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2 What is the meaning of the symbol z_O2?

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	Charge number of O2 = 4
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3 How are the units of electric energy [J] and electric force [V] related?

	V = J/C.
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4 Express -460 kJ/mol O₂ as electrical force in units of volt [V].

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	-460 [kJ/mol]/(4·e·NA [C/mol]) = -460 [kJ/mol]/(4·96,485.33 [C/mol]) = -0.00119189 kJ/C = -1.2 J/C = -1.2 V

5 Why should we do that?

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	To relate the driving force of electron transfer to the pmf, we have to express both forces in identical motive units [MU], converting either the force of the chemical reaction from the molar format to the electrical format, or the pmf from the electrical to the molar format.
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