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Which copper-containing protein acts as a mobile electron carrier between the cytochrome b6f complex and PS I?

  • (a) cytochrome f Your answer
  • (b) plastoquinone Your answer
  • (c) ferredoxin Your answer
  • (d) plastocyanin Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Plastocyanin is a small copper-containing protein in the thylakoid lumen. It carries electrons from the cytochrome b6f complex to PS I.

Why the other options are wrong

  • (a) · your answer Cytochrome f is part of the cytochrome b6f complex itself and contains iron (haem), not copper.
  • (b) · your answer Plastoquinone carries electrons from PS II to the cytochrome complex, and it has no copper.
  • (c) · your answer Ferredoxin is an iron-sulphur protein that accepts electrons from PS I.
NCERT point: Mobile carriers of the Z scheme: plastoquinone (PS II → cytochrome b6f) and plastocyanin (cytochrome b6f → PS I).
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