In addition, the proportion of each electron carrier (ferredoxin, NADP+, plastoquinone, cyt b559, cyt f, plastocyanin and cyt b6) that is oxidized during photosynthesis can be measured spectrophotometrically. From the data given below, identify each column with one of the electron carriers listed above, and give a short reason to justify each choice. One of the electron carriers might not be represented by a letter. There may be ambiguity, where you can’t narrow down one letter between two substances – that’s fine, just explain why you can’t tell. The number shows the proportion of the lettered electron carrier that is oxidized; that is 0.0 means none of that carrier is oxidized, and 1.0 means that it is fully oxidized. (attached table) A = B = C = D = E = F =
In addition, the proportion of each electron carrier (ferredoxin, NADP+, plastoquinone, cyt b559, cyt f, plastocyanin and cyt b6) that is oxidized during photosynthesis can be measured spectrophotometrically. From the data given below, identify each column with one of the electron carriers listed above, and give a short reason to justify each choice. One of the electron carriers might not be represented by a letter. There may be ambiguity, where you can’t narrow down one letter between two substances – that’s fine, just explain why you can’t tell. The number shows the proportion of the lettered electron carrier that is oxidized; that is 0.0 means none of that carrier is oxidized, and 1.0 means that it is fully oxidized. (attached table) A = B = C = D = E = F =
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
Related questions
Question
In addition, the proportion of each electron carrier (ferredoxin, NADP+,
plastoquinone, cyt b559, cyt f, plastocyanin and cyt b6) that is oxidized during
photosynthesis can be measured spectrophotometrically. From the data given below,
identify each column with one of the electron carriers listed above, and give a short
reason to justify each choice. One of the electron carriers might not be represented by a
letter. There may be ambiguity, where you can’t narrow down one letter between two
substances – that’s fine, just explain why you can’t tell.
plastoquinone, cyt b559, cyt f, plastocyanin and cyt b6) that is oxidized during
photosynthesis can be measured spectrophotometrically. From the data given below,
identify each column with one of the electron carriers listed above, and give a short
reason to justify each choice. One of the electron carriers might not be represented by a
letter. There may be ambiguity, where you can’t narrow down one letter between two
substances – that’s fine, just explain why you can’t tell.
The number shows the proportion of the lettered electron carrier that is oxidized; that is
0.0 means none of that carrier is oxidized, and 1.0 means that it is fully oxidized.
0.0 means none of that carrier is oxidized, and 1.0 means that it is fully oxidized.
(attached table)
A =
B =
C =
D =
E =
F =
A =
B =
C =
D =
E =
F =
Transcribed Image Text:Inhibitor added
none
methylviologen
Ferricyanide
DCMU
Phenazine
methosulfate
desaspidin
A
0.75
0.75
0.75
0.75
0.75
0.75
B
0.5
0.5
0.5
1.0
0.5
0.5
C
0.5
1.0
1.0
0.5
0.5
0.5
D
0.5
0.5
0.5
0.5
0.5
0.5
E
0.25
0.25
0.25
1.0
0.25
0.25
F
0.5
1.0
1.0
0.5
1.0
0.5
Transcribed Image Text: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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