In the Z-scheme of non-cyclic electron transport, what is the immediate electron acceptor that accepts excited electrons from the reaction center P680 of Photosystem II?
Answer and explanation
Correct answer: B. Pheophytin
- Step 1: Absorption of light at 680 nm excites the reaction center chlorophyll P680 to P680*.
- Step 2: P680* rapidly transfers an electron to pheophytin (a chlorophyll molecule lacking the central ion).
- Step 3: Pheophytin then transfers the electron sequentially to plastoquinones and , and onward to the cytochrome complex.
Answer
Pheophytin
Why not the others: 'Plastoquinone ()' is the second electron acceptor that receives electrons from reduced pheophytin; 'Cytochrome ' is a membrane protein complex further downstream that accepts electrons from mobile plastoquinol (); 'Ferredoxin' is an iron-sulfur protein associated with Photosystem I, not Photosystem II.
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