Which mobile, water-soluble, copper-containing protein functions on the luminal side of the thylakoid membrane to transfer electrons between the cytochrome b6f complex and Photosystem I?
Answer and explanation
Correct answer: D. Plastocyanin
- Step 1: In linear electron transport, electrons pass from cytochrome to the oxidized reaction center of Photosystem I.
- Step 2: This single-electron transfer is carried out by plastocyanin, a peripheral membrane protein located in the thylakoid lumen.
- Step 3: Plastocyanin contains a single copper ion that alternates between and oxidation states during electron transport.
Answer
Plastocyanin
Why not the others: 'Plastoquinone' is a lipid-soluble quinone embedded within the hydrophobic core of the thylakoid lipid bilayer that transfers electrons from PS II to cytochrome ; 'Ferredoxin' is a stromal-side iron-sulfur protein that accepts electrons from PS I; 'Cytochrome c1' is a component of mitochondrial Complex III, not chloroplast thylakoids.
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