Which photosystem (I, II, both or neither) is disrupted by each of the inhibitors?Explain how you arrived at your answer.DCMUMethylviologenDesaspidinFerricyanidePhenazine methosulfate Objective: To reconstruct some of the experiments that were performed onPhotosystems I and II in order to determine whether they were coupled, and thendetermine in what sequence the various electron carriers were used in transport.1. Use the photosystem I and II diagram below, which is similar but not identical tothe one in the text. As in oxidative phosphorylation, in which high-energy electrons aretransferred during the production of stored chemical energy, photosynthesis can beinhibited at different points within the system by a variety of chemicals.Ferredoxin (F)P700cyt b6●plastocyanin (PC)NADPHNADP+ + H+cyt fADP + PiATPcyt b559DCMU prevents oxidation of waterMethylviologen accepts electrons from P700H₂OPlastiquinone (Q)1/2 O₂ + 2 H+P680• Desaspidin uncouples phosphorylationFerricyanide accepts electrons from the end of the transport chainATPADP + P₁Phenazine methosulfate accepts electrons from ferrodoxin and donates the electronsdirectly to the transport chain

Photosystem I (PS I) is mainly composed of the P700 reaction center, ferredoxin, associated NADP+…

Answered: Which photosystem (I, II, both or…

Which photosystem (I, II, both or neither) is disrupted by each of the inhibitors? Explain how you arrived at your answer. DCMU Methylviologen Desaspidin Ferricyanide Phenazine methosulfate

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Question

Which photosystem (I, II, both or neither) is disrupted by each of the inhibitors?
Explain how you arrived at your answer.
DCMU
Methylviologen
Desaspidin
Ferricyanide
Phenazine methosulfate

Objective: To reconstruct some of the experiments that were performed on
Photosystems I and II in order to determine whether they were coupled, and then
determine in what sequence the various electron carriers were used in transport.
1. Use the photosystem I and II diagram below, which is similar but not identical to
the one in the text. As in oxidative phosphorylation, in which high-energy electrons are
transferred during the production of stored chemical energy, photosynthesis can be
inhibited at different points within the system by a variety of chemicals.
Ferredoxin (F)
P700
cyt b6
●
plastocyanin (PC)
NADPH
NADP+ + H+
cyt f
ADP + Pi
ATP
cyt b559
DCMU prevents oxidation of water
Methylviologen accepts electrons from P700
H₂O
Plastiquinone (Q)
1/2 O₂ + 2 H+
P680
• Desaspidin uncouples phosphorylation
Ferricyanide accepts electrons from the end of the transport chain
ATP
ADP + P₁
Phenazine methosulfate accepts electrons from ferrodoxin and donates the electrons
directly to the transport chain

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