125. Choose between the light dependent reaction or the Calvin cycle steps of photosynthesis
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- Which part of the light-independent reactions would be affected if a cell could not produce the enzyme RuBisCO?13. Statement 1: In the Calvin Cycle, two molecules of glyceraldehyde 3-phosphate are produced if two molecules of carbon dioxide are fixed. Statement 2: If the carbon fixation phase of the Calvin Cycle begins with 6 molecules of ribulose bisphosphate and 6 molecules of carbon dioxide, 2 out of 12 molecules of glyceraldehyde 3-phosphate made at the end of the reduction phase are used in carbohydrate production while the remaining 10 molecules are needed to keep the Calvin Cycle turning by regenerating ribulose bisphosphate. Statement 1 is true. Statement 2 is false. Statement 1 is false. Statement 2 is true. Both statements are true. Both statements are false.1.) True or False. In the second step of Light Dependent Reaction, P680 loses its electron and becomes positively charged (P680+)
- What is the significance that the combined absorption spectra of chlorophylls a and b roughly match the action spectrum of photosynthesis? Wouldphotosynthesis be more efficient if their individual absorption spectra coincided exactly?Even though very few cells in a C4 plant carry out the biosynthetic-Calvin pathway, yet they are highly productive, can you discuss why?48. If the thylakoid membrane became leaky to ions, what would you predict to be the result on the light reactions? Group of answer choices It would stop NADPH production. It would stop the transfer of electron from PSII to PSI. It would stop the oxidation of H2O. It would stop ATP production.
- EDTA was used as photophosphorylation uncoupler/inhibitor of ATP synthesis. What is EDTA and what is its mode of uncoupling? What is its mode of uncoupling in cholorplast? I know EDTA is ethylenediaminetetraacetic acid and is a chelating agent. I do not understand how to answer the question on its mode of uncoupling. Jagendorf, A.T, and E. Uribe, “ATP formation caused by acid-base transition of spinach chloroplasts, “ Proceedings of the National Academy of Sciences (USA) 55 (1965): 170-177Correctly identify the process, product, or requirement at each indicated step in the Calvin cycle diagram. Drag the appropriate labels to their respective targets. Reducing power input Removal of 6 C for biosynthesis Various sugar rearrangements Regeneration of CO₂ acceptor and energy input Carboxylation Energy input 6 CÔ, 6 ATP 6 Ribulose 1,5-bisphosphate (30 carbons) RubisCO 6 Ribulose Phosphoribulokinase 123-Phospho- glycerate (36 carbons) 5-phosphate (30 carbons) 10 Glyceraldehyde 3-phosphate (30 carbons) Overall stoichiometry: 6 CO₂ + 12 NADPH + 18 ATP- +12 NADP+ + 18 ADP + 17 P 12 ATP 121,3-Bisphospho- glycerate (36 carbons) 12 NAD(P)H 12 Glyceraldehyde 3-phosphate (36 carbons) Fructose 6-phosphate (6 carbons) To biosynthesis Reset Help C₂H₁₂O(PO₂H₂)Statement 1: In the Calvin Cycle, two molecules of glyceraldehyde 3-phosphate are produced if two molecules of carbon dioxide are fixed. Statement 2: If the carbon fixation phase of the Calvin Cycle begins with 6 molecules of ribulose bisphosphate and 6 molecules of carbon dioxide, 2 out of 12 molecules of glyceraldehyde 3-phosphate made at the end of the reduction phase are used in carbohydrate production while the remaining 10 molecules are needed to keep the Calvin Cycle turning by regenerating ribulose bisphosphate. Hide answer choices Statement 1 is true. Statement 2 is false. Statement 1 is false. Statement 2 is true. Both statements are true. Both statements are false
- Describe cyclic and non cyclic photo phosphorylation. Include all the stepsa) Draw the carboxylation reaction mechanism catalyzed by Rubisco. Include the substrates, products, key amino acid residues in the active site, and important metal ions. b) Describe each step in the Rubisco carboxylation reaction and why the carbamylated lysine is critical for enzyme activity. c. Describe the purpose of the "regeneration stage" of the Calvin-Benson cycle.2C. A “pulse-chase" experiment using "C-labeled glucose can be carried out on a yeast extract that is maintained under strictly anaerobic conditions. The experiment consists of incubating a small amount of "C-labeled substrate (the pulse) with the yeast extract just long enough for each intermediate in the fermentation pathway to become labeled. The label is then “chased" through the pathway by the addition of excess unlabeled glucose. The chase effectively prevents any further entry of labeled glucose into the pathway. 2 ADP 2 ATP Glucose ---> CH3 2 NAD* 2 NADH 2 Pyruvate H H H-C-OH C=0 CH3 CH3 2 co, 2 Ethanol 2 Acetylaldehyde (1) If [1-"C]glucose (glucose labeled at C-1 with "C) is used as a substrate, will there be any "C in the product (ii) Lactic acid is the final fermentation product in vertebrates, while ethanol is the final fermentation product in yeast. Lactic acid can be converted back into glucose while ethanol can not be. In the space below, use a thermodynamic rationale to…