The Constituents of the Electron Transport Chain Have Similar Capabilities

Multiple Choice

The constituents of the electron transport chain have similar capabilities, with the exception of ubiquinone (coenzyme Q) . What is different about ubiquinone?

A) Ubiquinone is a protein that begins the electron transport chain, so it accepts the highest-energy electrons.
B) Ubiquinone is a protein that serves as a regulator of the rate of redox reactions in the electron transport chain.
C) Ubiquinone is a protein that is a constituent of all cells, prokaryotic or eukaryotic; hence its name, originating from "ubiquitous."
D) Ubiquinone is not a protein, is lipid soluble, and can move through the inner mitochondrial membrane.