Biochemistry: Concepts and Connections (2nd Edition)
2nd Edition
ISBN: 9780134641621
Author: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews
Publisher: PEARSON
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Chapter 15, Problem 6P
The substance dichlorophenyldimethylurea (DCMU) is an herbicide that inhibits photosynthesis by blocking electron transfer between plastoquinones in photosystem ll.
a. Would you expect DCMU to interfere with cyclic photophosphorylationQ
b. Normally, DCMU blocks O2 evolution, but addition of ferricyanide to chloroplasts allows O2 evolution in the presence of DCMU. Explain.
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The substance dichlorophenyldimethylurea (DCMU) is an herbi-
cide that inhibits photosynthesis by blocking electron transfer
between plastoquinones in photosystem II.
(a) Would you expect DCMU to interfere with cyclic photophos-
phorylation?
(b) Normally, DCMU blocks Oz evolution, but addition of ferri-
cyanide to chloroplasts allows Oz evolution in the presence of
DCMU. Explain.
You performed an experiment on photosynthesis on Elodea, using bromothymol blue as an indicator forpH. Your two light conditions were red light and blue light. You found that in blue light, your solutionturned a nice cobalt blue, and in red light it turned green.a. What can you conclude about the efficiency of photosynthesis in Elodea regarding those twowavelengths?b. What would your conclusion be if your negative control (no Elodea in white light) turned greenalso?
A. The C4 plant performs photosynthesis more efficiently than the C3 when the CO2 concentration is 600ppm or less. Provide one reason why the rate of photosynthesis doesn’t change for the C4 plant when the CO2 concentration increases above 400 ppm.
B. Discuss what is happening in the C3 plant when the CO2 levels are below 50 ppm. Provide one reason why this does NOT happen to the C4 plant.
Chapter 15 Solutions
Biochemistry: Concepts and Connections (2nd Edition)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biochemistry and related others by exploring similar questions and additional content below.Similar questions
- The substance dichlorophenyldimethylurea (DCMU) is an herbicide that in- hibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II. (a) Would you expect DCMU to interfere with cyclic photophosphorylation? (b) Normally, DCMU blocks Oz evolution, but addition of ferricyanide to chloroplasts allows O, evolution in the presence of DCMU. Explain.arrow_forwardThe substance dichlorophenyldimethylurea (DCMU) is an herbicide thatinhibits photosynthesis by blocking electron transfer between plastoquinonesin photosystem II.(a) Would you expect DCMU to interfere with cyclic photophosphorylation?(b) Normally, DCMU blocks O2 evolution, but addition of ferricyanide tochloroplasts allows O2 evolution in the presence of DCMU. Explain.arrow_forwardIf you could replace all of the plant ATP synthase with ATP synthase enzymes from animal cells, oriented such that the Fo complex was in the thylakoid membrane with the open channel facing the thylakoid space, and the F1 complex was present in the stroma, how would this affect the ability of photosystem II to generate ATP? Assume that the animal cell ATP synthase functions normally in the chloroplast after replacement.arrow_forward
- The substance dichlorophenyldimethylurea (DCMU) is an herbicide thatinhibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II.(a) Would you expect DCMU to interfere with cyclic photophosphorylation?(b) Normally, DCMU blocks O2 evolution, but addition of ferricyanide to chloroplasts allows O2 evolution in the presence of DCMU. Explain.arrow_forwardA. Explain the role of ATP in life process. B. Complete the following table by comparing and contrasting the light-dependent and light-independent reactions of photosynthesis. You may use the link below for reference. https://youtu.be/KfvYQgT2M-k Light- independent reactions Point of Light-dependent reactions Comparison 1. Raw materials 2. Part of the chloroplasts where they occur 3. Light requirements 4. Products 15. Ву-productsarrow_forwardFor items 26 and 27 choose the letter of the best answer. No need to write the explanations.arrow_forward
- For items 26 - 29 choose the letter of the best answer. No need to write the explanations.arrow_forwardIn 2010, a bew form of chlorophyll (chlorophyll f) was discovered in cyanobacteria assemblages of stromatolites growing in Shark Bay, Australia. Chlorophyll f has been isolated. and scientists are investigating the structure and function of this pigment. Based on your understanding of photosynthesis, how would you determine the wavelengths of light the pigment absorbs? How would you determine if this pigment plays a role in photosynthesis? (Hint: Think about the overall equation for photosynthesis.)arrow_forwardWhich of the following statements is TRUE? Select one: a. The immediate product of the light energy absorbed by the P680 reaction center is used to produce NADPH. b. In cyclic photophosphorylation, the chlorophyll is reduced by electrons liberated from water molecules. c. The O2 gas produced during photosynthesis is derived from CO2. d. In noncyclic photophosphorylation, electrons from water are used directly for the reduction of P700. e. All of the statements are false.arrow_forward
- Chlamydomonas cells exposed to high light grow faster than cells grown under lower light. Why is that? A. Under high light, increased levels of G3P in the stromal of the chloroplast increase starch synthesis. B. Under high light, increased photosystem II activity leads to increased O2 levels which support higher rates of respiration. C. Under high light, high levels of cytosolic G3P support higher rates of cellular respiration and biosynthesis. D. Under high light, extra ATP can be exported from the mitochondria to support higher rates of glycolysis.arrow_forwardPlease answer option (c) with proper explanation.arrow_forwardIdentify the chemical basis for ApH and AY across the chloroplast thylakoid membrane by dragging the descriptions to their targets. Be sure to notice that the upper arrow iindicates ApH and the lower arrow indicates ΔΨ. ATP synthase complex H+ N ADP + P₁ Light energy ATP H*N Photosystem I/II- Chloroplast N side Aus PN ApH T + Thylakoid membrane HTp H+p Lumen Stroma P side Proton circuit A B High H concentration Low positive charge High positive charge Low H+ concentration Within the image, identify the types of proton translocation by dragging each label to its target. O XH₂ 2H+ + Z 2 H* ZH₂ O XH₂ Z 2H+ ZH₂ 2H+ C A B Proton pump Redox looparrow_forward
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