What is the Function of Heme Groups Found in the Cytochromes

Question

What is the function of heme groups found in the cytochromes in the electron transport chain?
A)accept and donate protons
B)accept and donate electrons
C)bind oxygen
D)bind ADP
E)bind hydrogen atoms

Accepted Answer

Heme groups in the cytochromes function as electron carriers, accepting and donating electrons during the electron transport chain.