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.

Question

Quizplus · Accepted Answer

Ubiquinone is not a protein and is lipid soluble, allowing it to move through the hydrophobic environment of the inner mitochondrial membrane. This ability to move freely in the membrane allows it to shuttle electrons between complexes I and III in the electron transport chain.

The Constituents of the Electron Transport Chain Have Similar Capabilities