In cytochromes, the heme group plays a key role in acquiring and transferring electrons with a(n) __________ transition. A) Mg⁰/Mg²⁺ B) S⁰/S^2- C) Cu⁺/Cu²⁺ D) Fe³⁺/Fe²⁺ E) Mn⁰/Mn²⁺

Question

Quizplus · Accepted Answer

Heme is a cofactor found in cytochromes that is composed of an iron atom coordinated to a porphyrin molecule. In cytochromes, the heme group plays a key role in acquiring and transferring electrons with a Fe2+/Fe3+ transition. Therefore, choice D describing Fe³⁺/Fe²⁺ best explains the role of heme in cytochromes.

In Cytochromes, the Heme Group Plays a Key Role in Acquiring