Question

donates electrons to oxygen is
(a) Cyt. b (b) Cyt. c
(c) Cyt. a₁ (d) Cyt. a₃

Answer 1

Answer:

Cyt.a1...

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Answer 2

(d) Cyt. a₃

Explanation:

In the electron transport chain, Electrons are transferred from NADH  and FADH  to different complexes such as FMN, cyt c1, cyt a and cyt a3 and finally goes to oxygen molecule. Thus the last electron donor to the oxygen molecule is cyt a3, that is the part of complex iv. Oxygen molecule accepted electron at the end of electron transport chain and form water molecules.