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?
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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?
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- 1. A) For the schematic of a chloroplast shown in the image attached, match the major input and output molecules of photosynthesis to the letters shown. Molecules: CO2, H2O, O2, sugar A: B: C: D: B) In the image attached, the light reactions are shown to take place in the thylakoid. Where specifically do these reactions take place? C) Where does the Calvin cycle take place?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?In photosynthesis, contrast the light reactions with the light independent reactions, in terms of goals, inputs, and outputs of each. Spatially where do they take place (which parts of the chloroplast)? (Optional, for further discussion: Could there be light reactions without light-independent reactions, or visa-versa?)
- would you expect an absorption spectrum graph of chlorophyll (green plant pigment involved in photosynthesis) to be the same or not of that for the red food coloring? why?In cyclic photophosphorylation, it is estimated that two electrons must be passed through the cycle to pump enough protons to generate one ATP. Assuming that the ΔG for hydrolysis of ATP under conditions existing in the chloroplast is about -50 kJ/mol, what is the corresponding percent efficiency of cyclic photophosphorylation, using light of 700 nm?For the following questions, choose one to discuss: chloroplast/photosynthesis State at the outset which one you will discuss. A) What role do proton gradients play in the process of photosynthesis proton gradients allow B) Where are proton gradients formed? Within what structures are they seen in chloroplasts How do the structures help them to maintain a gradient? C) Explain where and how the chloroplast or mitochondria uses passive transport and active transport to complete photosynthesis or cellular respiration.
- What is photophosphorylation by oxidative phosphorylation? Explain by comparison.What is the chemical species that is transferred through the light reactions? (Box A) What energy-rich compound is produced by the actions of the cytochrome complex? (Box B) What is the compound (Box C) used to donate electrons to the photosystems, and which gives rise to 2H+ and O2. What energy is used to energise the light reactions? (Box D) What is the product of the reaction that is occurring at NADP+ reductase? (Box E) Provide names for structures i and iiIn cyclic photophosphorylation, it is estimated that two electrons must be passed through the cycle to pump enough protons to gener- ate one ATP. Assuming that the AG for hydrolysis of ATP under con- ditions existing in the chloroplast is about –50 kJ/mol, what is the corresponding percent efficiency of cyclic photophosphorylation, using light of 700 nm?
- 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 loopIn cyclic photophosphorylation, it is estimated that two electrons must be passed through the cycle to pump enough protons to generate one ATP. Assuming that the AG for hydrolysis of ATP under conditions existing in the chloroplast is about –50 kJ/mol, what is the corresponding percent ef- ficiency of cyclic photophosphorylation, using light of 700 nm?Chlorophyll a and chlorophyll b both play roles in photosynthesis. Using no more than one sentence to respond for each segment, please: 1) Outline the roles/functions that chlorophyll b play that are different from those for chlorophyll a 2) Outline the roles/functions that chlorophyll a play that are different from those for chlorophyll b