A) ferredoxin
B) cytochrome
C) plastocyanin
D) an iron-sulphur protein
Correct Answer: D
Solution :
In photogystem-l, 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 \[\underset{Chlrophyll-a\text{ }\,\,\,\,Phylloquinone\text{ (}Fe-s)\,Protein}{\mathop{{{P}_{700}}\xrightarrow{{{e}^{-}}}{{A}_{1}}\xrightarrow{{{e}^{-}}}{{A}_{2}}}}\,\xrightarrow{{{e}^{-}}}\underset{{{P}_{430.}}}{\mathop{{{A}_{3}}}}\,\] The reduced \[{{P}_{430}}\] passes its electrons to ferridoxin (Fd) present at outer surface of thylakoid membrane.
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