The following (P through U) are the main steps of chemosynthetic ATP synthesis in the light reaction. Which places them in correct order?
P. H+ concentration gradient established
Q. H+ diffuses through ATP synthetase
R. Carriers use energy from electrons to move H+ across the membrane
S. Electrons from PSII pass along electron transport chain
T. Light excites electrons in PSII
U. Energy of H+ flow is used by ATP synthetase to make ATP.
The following (P through U) are the main steps of chemosynthetic ATP synthesis in the light reaction. Which places them in correct order?
P. H+ concentration gradient established
Q. H+ diffuses through ATP synthetase
R. Carriers use energy from electrons to move H+ across the membrane
S. Electrons from PSII pass along electron transport chain
T. Light excites electrons in PSII
U. Energy of H+ flow is used by ATP synthetase to make ATP.
The correct option is C TSRPQU
In the non-cyclic electron and proton translocation, Light falls on the reaction centre of PS-II. Electrons by absorbing light energy excited and comes out from the reaction centre. These energised electrons through different electron carriers, enter into the PS-I and finally reached to NADP+. Simultaneously Protons by the splitting of water molecules and from stroma through quinone cycle reaches into the lumen of the thylakoid. It results in the establishment of a proton concentration gradient. Due to this, protons from the lumen through ATP synthase reaches into the stroma of the chloroplast. Simultaneously, the energy of the protons is trapped and added to ADP, ATP formation occurs.
So, the correct option is ‘TSRPQU’.
In the non-cyclic electron and proton translocation, Light falls on the reaction centre of PS-II. Electrons by absorbing light energy excited and comes out from the reaction centre. These energised electrons through different electron carriers, enter into the PS-I and finally reached to NADP+. Simultaneously Protons by the splitting of water molecules and from stroma through quinone cycle reaches into the lumen of the thylakoid. It results in the establishment of a proton concentration gradient. Due to this, protons from the lumen through ATP synthase reaches into the stroma of the chloroplast. Simultaneously, the energy of the protons is trapped and added to ADP, ATP formation occurs.
So, the correct option is ‘TSRPQU’.
