Choose the CORRECT order of reactions that are conducted by photosystem I. P700 is activated by two photons → two Chl A0 accept two high-energy electrons → one quinone A1 is fully reduced → two electrons are passed on one 4Fe–4S cluster → two molecules of ferredoxin are reduced → ferredoxin–NADP+ reductase takes two protons from the stroma and reduces one NADP+ P680 is activated by two photons → two Chl A0 accept two high-energy electrons → two molecules of ferredoxin are reduced → ferredoxin–NADP+ reductase oxidizes one ferredoxin at a time to reduce FAD to FADH- and then to FADH2 → the proton-motive force is created P700 is activated by a photon → Chl A0 accepts two high-energy electrons → one plastoquinone QA is fully reduced → two electrons are passed on one 4Fe–4S cluster → two molecules of ferredoxin are reduced → ferredoxin–NADP+ reductase takes two protons from the stroma and reduces one FAD P700 is activated by a photon → pheophytin accepts two high-energy electrons → two bound plastiquinones are reduced → cytochrome b6f oxidizes plastoquinols to reduce FAD → two protons are pumped to the stroma P680 is activated by a photon → pheophytin accepts one high-energy electron → one mobile plastiquinone is fully reduced → cytochrome b6f oxidizes plastoquinol to reduce FAD → two protons are pumped to the thylakoid lumen

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter20: The Protists

Section: Chapter Questions

Problem 4CT: Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of...

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Choose the CORRECT order of reactions that are conducted by photosystem I.

P700 is activated by two photons → two Chl A₀ accept two high-energy electrons → one quinone A₁ is fully reduced → two electrons are passed on one 4Fe–4S cluster → two molecules of ferredoxin are reduced → ferredoxin–NADP⁺ reductase takes two protons from the stroma and reduces one NADP⁺

P680 is activated by two photons → two Chl A₀ accept two high-energy electrons → two molecules of ferredoxin are reduced → ferredoxin–NADP⁺ reductase oxidizes one ferredoxin at a time to reduce FAD to FADH^- and then to FADH₂ → the proton-motive force is created

P700 is activated by a photon → Chl A₀ accepts two high-energy electrons → one plastoquinone Q_A is fully reduced → two electrons are passed on one 4Fe–4S cluster → two molecules of ferredoxin are reduced → ferredoxin–NADP⁺ reductase takes two protons from the stroma and reduces one FAD

P700 is activated by a photon → pheophytin accepts two high-energy electrons → two bound plastiquinones are reduced → cytochrome b₆f oxidizes plastoquinols to reduce FAD → two protons are pumped to the stroma

P680 is activated by a photon → pheophytin accepts one high-energy electron → one mobile plastiquinone is fully reduced → cytochrome b₆f oxidizes plastoquinol to reduce FAD → two protons are pumped to the thylakoid lumen

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