Complex IV in ETS also known as cytochrome c oxidase consists of

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Cytochromes a₁ and a₃ and two Fe-S centers

Fe-S and FMN

Cytochromes b and c1only

Cytochromes a₁,a₃ and two copper centers

answer is D.

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Detailed Solution

Complex IV refers to cytochrome c oxidase complex containing cytochromes a and a3 and two copper centres.It receives electrons from the mobile electron carrier Cytochrome c which is a small protein attached to the outer surface of the inner membrane and acts as a mobile carrier for transfer of electrons between complex III and IV.

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