Question

a) In terms of the electron transport chain, what is a “coupling site”?

b) Using redox calculations, prove that there are three coupling
sites in the electron transport chain in mitochondria. This means
that for each reaction, you should write out the balanced redox
equation for the reaction, calculate the ΔE^{0}, and
calculate the ΔG^{0}.

Answer #1

**a) Coupling
site:**

The linking of two independent processes by a common
intermediate is called as coupling,for example the
**coupling** of electron transport to oxidative
phosphorylation or the ATP and ADP conversion to transport
processes.The place or the site where the coupling reaction takes
place is the coupling site.

**b)** There are three coupling sites in the
electron transport chain in mitochondria since the electron
transport chain occurs by using the three major enzyme complexes of
the respiratory chain ubiquinone and cytochrome c diffuse rapidly
in the plane of the inner mitochondrial membrane.There are three
coupling sites in a ETC in mitochondria.

where is the Gibbs free energy

n is the number of electrons

F is the Faraday constant

is the reduction potential

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