Question

Which of the following is not a protein in ETS

• A. Ubiquinone (CoQ) cytochrome
• B. Cytochrome
• C. Cytochrome c
• D. All of these

Answer 1

The correct option is B Cytochrome

In ETS, electrons from NADH produced in the mitochondrial matrix during the citric acid cycle are oxidised by an NADH dehydrogenase complex( complex 1), and electrons are then transferred to ubiquinone. Ubiquinone also receives reducing equivalents via FADH2 (complex II) that is generated during oxidation of succinate in the civic acid cycle. The reduced ubiquinone is then oxidized with the transfer of electrons to cytochrome c via cytochrome bC1 complex (complex III). Complex IV refers to cytochrome c oxidase complex containing cytochrome's a and a3 and two copper centres.

So the correct option is " cytochrome".