VPY-0053
QUESTION
Carriers in ETC function in order of?
OPTIONS
(A) Increasing reduction potential
(B) Decreasing reduction potential
(C) Based on their position in mitochondrion
(D) Based on order of enzymes
ANSWER
(A) Increasing reduction potential
EXPLANATION
Increasing reduction potential is the correct option because electrons move through the mitochondrial electron transport chain from carriers with relatively lower reduction potential toward carriers with progressively higher reduction potential, ultimately reducing oxygen to water. The sequence is not defined simply by decreasing reduction potential, physical position alone, or the order of unrelated enzymes.