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  4. In photosystem-I, the first electron acceptor is

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Q. In photosystem-I, the first electron acceptor is

Bihar CECEBihar CECE 2013

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.