Multiple choice Mobile electron carriers in ETS are PC & Cyt C Co Q & Cyt C PQ & PC PQ & PC Reveal answer Fill a bubble to check yourself B Correct answer Explanation Coenzyme Q (ubiquinone) and Cytochrome c are the two mobile electron carriers in the electron transport system. CoQ moves within the membrane, while Cytochrome c moves along the outer surface of the inner mitochondrial membrane.