FNR FD Cytochrome b6f complex ATP PS II IRS II synthase PC KEY: PSII. photosyste
ID: 202318 • Letter: F
Question
FNR FD Cytochrome b6f complex ATP PS II IRS II synthase PC KEY: PSII. photosystem two; PQ. plastoquinone: PC, plastocyanin; PSI, photosystem one; FD, ferrodoxin; FNR, ferrodoxin NADP reductase 4. Which of the above components is the initial oxidant? (1 point) The reduction-oxidation ( redox") reaction between Photosystem II (PSII) and Plastoquinone (PQ) produces energy. In this redox reaction, which chemical species is more electronegative? Photosystem or Plastquinone? 1 point) 5. 6. Is Cyctochrome bóf reduced or oxidized by Plastocyanin (PC)? (1 point) 7. For the electron transfer between Plastoquinone (PQ) and Cytochrome bof, is Plastoqainone an oxidant or a reductant? (1 point)Explanation / Answer
4. Initial oxidant in the above ETS (Electron Transport System-) is PS II. PS II upon absorption of photon an Electron is excited to higher energy level. Removal of Electron is oxidation so PS II is the initial oxidising agent.
5. One which donates Electron quickly is considered as more electro negative or good reducing agent. Among PS II and PQ, Strong reducing or more electro negative agent is PQ. PS II needs more energy to donates elctron rather than PQ. Whereas PQ needs less energy to donates elctron.
6. Cytochrome b6f is oxidised by the PC. Cytochrome b6f donates it's electron and is accepted by PC. So PC accepts Electron and become reduced and Cytochrome oxidised.
7. PQ is a reducing agent for Cytochrome. PQ donates Electron by oxidation and Cytochrome reduced by accepting the Electron
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