Question

what is the correct order of electron transport compounds from best electron donor to best electron acceptor?
o₂ - cyt a of complex iv - cyt c - fe - s of complex iii - q - fe - s of complex i - nadh
o₂ - fe - s of complex i - nadh - q - fe - s of complex iii - cyt c - cyt a of complex iv
nadh - fe - s of complex i - q - fe - s of complex iii - cyt c - cyt a of complex iv - o₂
nadh - cyt c - fe - s of complex i - q - fe - s of complex iii - cyt a of complex iv - o₂

Explanation:

In the electron - transport chain, NADH is the initial electron donor. Electrons from NADH first pass through Fe - S clusters in Complex I. Then, electrons are transferred to coenzyme Q (Q). From Q, electrons move to Fe - S clusters in Complex III. Next, electrons are passed to cytochrome c (Cyt c). Then, electrons go to cytochrome a (Cyt a) in Complex IV. Finally, \(O_2\) is the terminal electron acceptor.

Answer:

NADH -- Fe - S of Complex I -- Q -- Fe - S of Complex III -- Cyt c -- Cyt a of Complex IV -- \(O_2\) (the third option)