For items 28 and 29 choose the letter of the best answer. No need to write the explanations. 28. Which of the following statements is a correct distinction between cyclic andnoncyclic photophosphorylation? *A. only noncyclic photophosphorylation produces ATPB. only cyclic photophosphorylation utilizes light at 700 nmC. only noncyclic photophosphorylation can operate in the absence of photosystem I|D. in addition to ATP, cyclic photophosphorylation also produces 02 and NADPH29. A culture of green algae was kept at a constant temperature and subjected toperiods of dark and light. It consumed an average of 7 cm3 of oxygen per hourby respiration in either light or dark conditions. When in light conditions, itproduced an average of 23 cm3 of oxygen per hour of photosynthesis. What isthe net volume of oxygen produced by the algae over a 24-hour periodconsisting of 14 hours of dark followed by 10 hours of light? *A. 38 cm3B. 62 cm3C. 132 cm3D. 160 cm3

Introduction Photophosphorylation Is The Phosphorylation Of ADP To Create ATP Utilising The Energy…

28. Which of the following statements is a correct distinction between cyclic and honcyclic photophosphorylation? * A. only noncyclic photophosphorylation produces ATP B. only cyclic photophosphorylation utilizes light at 700 nm C. only noncyclic photophosphorylation can operate in the absence of photosystem I| D. in addition to ATP, cyclic photophosphorylation also produces 02 and NADPH

28. Which of the following statements is a correct distinction between cyclic and honcyclic photophosphorylation? * A. only noncyclic photophosphorylation produces ATP B. only cyclic photophosphorylation utilizes light at 700 nm C. only noncyclic photophosphorylation can operate in the absence of photosystem I| D. in addition to ATP, cyclic photophosphorylation also produces 02 and NADPH

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter21: Photosynthesis

Section: Chapter Questions

Problem 5P: The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If...

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The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If noncyclic photosynthetic electron transport leads to the translocation of 7 H+/2e- and cyclic photosynthetic electron transport leads to the translocation of 2 H+/e-, what is the relative photosynthetic efficiency of ATP synthesis (expressed as the number of photons absorbed per ATP synthesized) for noncyclic versus cyclic photophosphorylation? (Assume that the CF1CF0-ATP synthase yields 3 ATP/14 H+.)
The Overall Free Energy Change for Photosynthetic NADP+ Reduction What is the overall free energy change (G) for noncyclic photosynthetic electron transport? 4 (700-nm photons) + 4 (680-nm photons) + 2 H2O + 2 NADP+O2 + 2 NADPH + 2H+
Describe the flow of electrons through photosystems I and II in the noncyclic electron transport pathway and the products produced. Contrast this flow with cyclic electron transport.
Which of the following is a correct step in the light-dependent reactions of the Z system? a. Light is absorbed at P700, and electrons flow through a pathway to NADP+, the final acceptor of the linear pathway. b. Electrons flow from photosystem II to water. c. NADP+ is oxidized to NADPH as it accepts electrons. d. Water is degraded to activate P680. e. Electrons pass through a thylakoid membrane to create energy to pump H+ through the cytochrome complex.
What is the significance that the combined absorption spectra of chlorophylls a and b roughly match the action spectrum of photosynthesis? Would photosynthesis be more efficient if their individual absorption spectra coincided exactly?
Identify 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 loop
In cyclic photophosphorylation, it is estimated that two electrons must bepassed through the cycle to pump enough protons to generate one ATP.Assuming that the ∆G for hydrolysis of ATP under conditions existing inthe chloroplast is about -50 kJ/mol, what is the corresponding percent efficiency of cyclic photophosphorylation, using light of 700 nm?
When running cycle photophosphorylation and passaging electrons from PSI to two fully reduced PQH2s, how many photons would be necessary for the electrons to complete one cycle?
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.
Provide a simplified schematic presentation of (non-cyclic) photophosphorylation. Clearly indicate the location and direction of electron and proton flow as well as organelle compartments. (You can also draw the Z-scheme but then you have to include ADP phosphorylation).
Which of the following statements about the light reactions of photosynthesis are correct? 1. Absorption of light does one thing: it makes chlorophyll easier to oxidize. 2. In PSII, the rate of damage to the D1 protein can never exceeds the rate of repair. 3. Electron transport is spontaneous (exergonic) as electrons move from P680* to P700+. 4. Compared to anoxygenic photosynthesis, in oxygenic photosynthesis less light needs to be absorbed to reduce NADP+. A. 1,2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1,2,3 and 4 are correct
n cyclic photophosphorylation in photosystem I, ATP is produced, even though water is not split. Explain how the process takes place