This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
True about transfer of electrons in electron transpo chain is ? 
Select and explain. 
A. All the complexes are arranged in an increasing order of redox potential, B. The direction of transpo of electrons in Complex I ->C - Complex III Q - Complex IV, C. All the complexes are arranged in an increasing order of energy, D. 10 hydrogen ions get translocated when FADH2 electrons get into electron transpo chain
A: All the complexes are arranged in an increasing order of redox potential
Answer: A: All the complexes are arranged in an increasing order of redox potential 
Explanation: Ans. is 'a' i.e., All the complexes are arranged in an increasing order of redox potential*The complexes of electron transpo chain are arranged in an increasing order of redox potential or decreasing order of energy level.The direction of transpo of electrons from NADH is Complex I -) Q Complex III -) Complex C -> Complex IV Oxygen.The direction of transpo of electrons from FADH2 is Complexx II Q Complex III - Complex C -) Complex IV - Oxygen.