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A. What determines the direction of electron flow in the electron transport chain? B. What is...

A. What determines the direction of electron flow in the electron transport chain? B. What is the expression for energy of the FADH2 reduction reaction?

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Answer #1

A.In electron transport chain,each of the cytochromes has a different reduction potential or the ability to accept an electron and this determines the unidirectional electron flow in the electron transport chain. Also,electrons always tend to flow from one redox couple pair to another in the direction of the more positive.So, the electrons will flow from NADH/NAD+(relatively electronegative conjugate redox pair) to reduced cytochrome c/oxidized cytochrome c ( the more electropositive pair )and in the same way to water/oxygen pair.

B.

FADH2 + 1/2 O2 FAD +H2O ; ΔG°′ =   -43.4 kcal/mol .........Exergonic reaction

1 FADH2 molecule yields 2 ATP mocleules in ETC.

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