Question 4: A recently discovered bacterium carries out ATP synthesis coupled to

Question

Question 4: A recently discovered bacterium carries out ATP synthesis coupled to the flow of electrons through a chain of carriers to some electron acceptor. The components of its electron transfer chain differ from those found in mitochondria: they are listed below with their standard reduction potentials. Electron carriers in the newly discovered bacterium: 1) Place the electron carriers in the order in which they are most likely to act in carrying electrons. 2) Is it likely that 02 (for which E? = 0.82 V) is the final electron acceptor in this organism? Why or why not? 3) How would you calculate the maximum number of ATP molecules that could theoretically be synthesized, under standard conditions, per pair of electrons transferred through this chain of carriers? (The Faraday constant, , is 96.48 kJ/Vmol.) AG Degree for ATP synthesis is +30.5 kJ/mol.

Explanation / Answer

1. The order of electron carriers is, Flavoproteon b (FP b)----------> Nicotinamide adenone dinulceotide (NAD+). ---------> Cytochrome C (cyt c) --------------> Flavoprotein a (FP a). ---------> Fe-S protein b.

2,. In the given list of electron carriers, Fe-S protein is having greater E'° value, so it will be thw final electron acceptor but not oxygen.

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