Question

Copper is a structural component of

• A. Plastocyanin
• B. Cytochrome a${}_3$
• C. Cytochrome oxidase
• D. All of the above

Answer 1

The correct option is D All of the above

Plastocyanin is the mobile electron carrier protein of thylakoid membrane which transfers electrons from cytochrome b6f complex to photosystem I during the light reaction in chloroplast. The cytochromes are components of mitochondrial electron transport system. Cytochrome a${}_3$ contains two copper centres. Both cytochrome a and a${}_3$ function as cytochrome oxidase and transfer electrons to oxygen.