
In Z-scheme of electron transport, water splitting complex supplies electrons to
A.
B. Plastoquinone
C. Pheophytin
D.
Answer
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Hint: During the non-cyclic flow of electrons, the two photosystems are connected in the series as and . The Z-scheme or non-cyclic flow of electrons begins with the absorption of a photon by followed by I. When absorbs the photon, it excites and transfer the electrons to Pheophytin which in turn passes the electron to .
Complete answer:
Step 1: The splitting of water is catalysed by the oxygen evolving complex (OEC), a protein complex present on the luminal surface of the thylakoid membrane. OEC oxidizes water and passes on the 4 electrons one at a time to the ( ).
Step 2: After receiving the electron, excites to . This excited reaction centre then passes on the electrons to Pheophytin, a chlorophyll in which the Magnesium ion in the centre has been replaced by two hydrogen atoms. Pheophytin transfers the electrons to the and . pass the electrons to the complex which in turn passes these electrons to the Plastocyanin, a blue-coloured Copper containing protein.
Step 3: receives the electrons from Plastocyanin and after absorption of a photon get excited from to . The excited then passes these electrons to the primary electron acceptor A0 which then passes the electrons to A1 which is a phylloquinone also called .
Step 4: A1 then pass the electrons to a series of Iron-sulfur proteins ( ) which finally transfers the electrons to soluble Ferredoxin followed by FNR (Flavoprotein- Ferredoxin-NADP reductase) which reduces the to .
Hence, the correct answer is option (D).
Note: The was discovered by Louis Duysens and the was discovered by Pierre Joliot. These two photosystems contain many pigments which help to trap light energy and convert them to chemical energy.
Complete answer:
Step 1: The splitting of water is catalysed by the oxygen evolving complex (OEC), a protein complex present on the luminal surface of the thylakoid membrane. OEC oxidizes water and passes on the 4 electrons one at a time to the
Step 2: After receiving the electron,
Step 3:
Step 4: A1 then pass the electrons to a series of Iron-sulfur proteins (
Hence, the correct answer is option (D).
Note: The
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