Question

Which component of ETC is not a protein?

• A. Cytochrome
• B. Ubiquinone
• C. Cytochrome oxidase
• D. All of the above

Answer 1

The correct option is B Ubiquinone

ETC is a series of coenzymes, cytochromes and associated enzymes that accept and transfer electrons from higher energy complexes to lower energy complexes. Most of the components of ETC are large protein complexes embedded in the inner membrane of mitochondria that accept electrons and pass them to further components. However, ubiquinone, a part of ETS is a 1,4- benzoquinone and not a protein.

So the answer is 'Ubiquinone'.