Question

Which one of the following contains copper besides iron?

• A. Cytochrome f
• B. Cytochrome oxidase
• C. Plastoquinone
• D. Cytochrome $c_1$

Answer 1

The correct option is B Cytochrome oxidase

The enzyme cytochrome oxidase, or Complex IV, is a large transmembrane protein complex found in bacteria and the mitochondrion of eukaryotes. It is the last enzyme in the respiratory electron transport chain of mitochondria or bacteria located in the mitochondrial or bacterial membrane. The complex contains two hemes, a cytochrome a and cytochrome a${}_3$, and two copper centers.

So, the correct answer is 'Cytochrome oxidase'