Question

Which one is $C{u}^{++}$ containing protein complex?

• A. Ferredoxin
• B. Plastocyanin
• C. Plastoquinone
• D. Cytochrome

Answer 1

The correct option is B Plastocyanin

Plastocyanin is a mobile electron carrier in the thylakoid membrane, which transfers electrons from cytochrome $b_6$-f complex to photosystem I during noncyclic electron flow. During non-cyclic electron flow from pheophytin, the electron moves downhill through quinone (Q), reduced plastoquinone ($PQ{H}_2$), cytochrome $b_6$-f complex, plastocyanin (PC) and then to P${}_7$${}_0$${}_0$ of photosystem I. The plastocyanin is a copper-containing protein. Its reduced form is colourless but the oxidised form is blue.

So, the correct answer is option B.