Proton Gradient Formation in Photosystems — NEET Biology
📚 Practice ConceptAs electrons move through the photosystems, protons are transported across the membrane. This happens because the primary acceptor of electron which is located towards the outer side of the membrane transfers its electron not to an electron carrier but to an H carrier. Hence, this molecule removes a proton from the stroma while transporting an electron. When this molecule passes on its electron to the electron carrier on the inner side of the membrane, the proton is released into the inner side or the lumen side of the membrane.
Which of the above statements regarding the light reaction of photosynthesis are NOT correct? S1: The primary acceptor of electrons in Photosystem II is located towards the inner side of the thylakoid membrane. S2: Both Photosystem I and Photosystem II are functionally involved in non-cyclic photophosphorylation. S3: Cyclic photophosphorylation results in the synthesis of both ATP and NADPH + H+. S4: The splitting of water (photolysis) occurs on the outer side of the thylakoid membrane, releasing protons into the chloroplast stroma. S5: The synthesis of ATP via chemiosmosis is powered by the breakdown of the proton gradient across the thylakoid membrane.
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