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.It therefore accepts high-energy electrons.
B)Ubiquinone is a protein that serves as a regulator of the speed 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.
D)Ubiquinone is lipid soluble and can therefore move through the inner mitochondrial membrane.

Question

Quizplus · Accepted Answer

The best choice is D because it correctly states that ubiquinone is lipid soluble, which allows it to move through the hydrophobic inner mitochondrial membrane. This property allows ubiquinone to shuttle electrons between complex I and complex III of the electron transport chain. The other options are incorrect because ubiquinone is not a protein, it does not regulate the speed of redox reactions, and its name does not refer to its presence in all cells.

The Constituents of the Electron Transport Chain Have Similar Capabilities,with