A) ferredoxin
B) cytochrome
C) plastocyanin
D) an iron-sulphur protein
Correct Answer: D
Solution :
In photogystem I, the primary electron acceptor is probably a Fe - S protein. The reduced primary acceptor transfers the electrons to secondary electron acceptor (most probably \[{{P}_{430}}\]) The sequence of electron transfer is as follows: \[\underset{(Chl.\,{{a}^{+}})}{\mathop{{{P}_{700}}}}\,\xrightarrow[{}]{{{e}^{-}}}\,\underset{(phylloquinone)}{\mathop{{{A}_{1}}}}\,\xrightarrow[{}]{{{e}^{-}}}\underset{\begin{smallmatrix} Fe+S \\ protein) \end{smallmatrix}}{\mathop{{{A}_{2}}}}\,\xrightarrow{{{e}^{-}}}\underset{({{P}_{430}})}{\mathop{{{A}_{3}}}}\,\] The reduced \[{{P}_{430}}\] passes its electrons to ferredoxin (Fd) present at outer surface of thylakoid membrane.
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