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What enzyme fixes CO2 in bundle sheath cell of chloroplasts in Calvin Cycle of C4 plants?
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- What is so special about thylakoid membranes (and chloroplasts in general) that allow it to be the site for photosynthetic activity in plants?In terms of the spatial organization of photosynthesis within the chloroplast, what is the advantage of the light reactions producing NADPH and ATP on the stroma side of the thylakoid membrane?How many water molecules have to be split as part of the light reactions to produce enough ATP and NADPH for the Calvin cycle to produce one molecule of glyceraldehyde-3-phosphate (G3P)? STROMA (low H+ concentration) Light THYLAKOID SPACE (high H+ concentration) STROMA (low H+ concentration) Photosystem II 4 H+ H₂O 1 1/2 0₂ +2 H+ Thylakoid membrane Cytochrome complex Light Pq 4 H+ Photosystem I Pc ATP synthase ADP + H+ Fd M ATP NADP+ reductase NADP+ + H+ NADPH To Calvin Cycle
- Where is the electrochemical gradient located in the chloroplast? Why is it important? Why are the Light Independent Reactions important? Name the 3 stages of the Calvin Cycle? What is the function of ribulose bisphosphate, RUBISCO, glyceraldehyde 3- phosphate in the Calvin Cycle? How much energy is utilized? What is Carbon Fixation? What is Photorespiration? Why is it wasteful? Why are some plants called C4 plants and why are they important? How have they adapted to unfavorable climatic conditions? How do the activities of C4 plants compare with the activities of CAM plants?If 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.In the light-dependent reaction of photosynthesis, what specifically happens in the electron transport chain between Photosystem II and Photosystem I? The excited electron accepted by the primary acceptor in Photosystem II is transferred to pheophytin and plastoquinones, then to cytochrome complex, and finally to plastocyanin. Plastocyanin then transfers the electron to the P700 in the reaction center complex of Photosystem I. The excited electron accepted by the primary acceptor in Photosystem I is transferred to pheophytin and plastoquinones, then to cytochrome complex, and finally to plastocyanin. Plastocyanin then transfers the electron to the P700 in the reaction center complex of Photosystem II. The excited electron accepted by the primary acceptor in Photosystem I is transferred to plastocyanin, then to cytochrome complex, and finally to pheophytin and plastoquinones. Plastoquinone then transfers the electron to the P700 in the reaction center complex of Photosystem II.…
- What enzyme fixes CO2 in the cytosol of a mesophyll cell in a C4 plants? Why is the C4 photosynthesis called C4 photosynthesis?C4 plants have higher photosynthetic rates than C3 plants because they have an additional CO2-fixing enzyme located in the bundle sheath cells.What special adaptation has evolved in CAM plants such as cacti and stonecrops that allows CO2 fixation and the Calvin cycle to occur in the same cell, but still occur separately? Briefly describe how this separation of events works.
- For most plants, two distinct photosystems (Photosystem I and Photosystem II) work together in series during photosynthesis. These photosystems are complexes of proteins and pigment molecules. Statement 1: Photosystem I has an absorption maximum of 680 nm, whereas Photosystem II has an absorption maximum of 700 nm. Statement 2: The special pair of chlorophyll a molecules in the reaction center of photosystem I is designated as P700, whereas the special pair of chlorophyll a molecules in the reaction center of photosystem II is designated as P680. Statement 1 is true. Statement 2 is false. Statement 1 is false. Statement 2 is true. Both statements are true. Both statements are false.if mutation makes photosystem I function less efficiently, which of the following is most directly affected? rate of ATP sythesis by ATP sythase in cholorplast? Rate at which protons are transported into thylakoid? Rate at whinch NADPH is produce? a mount of O2 produced?What happens during the carbon fixation stage of the Calvin Cycle (light-indepedent reactions)? Energy from ATP and electrons from NADPH are used to reduce 3-phosphoglycerate to form G3P molecules (which can be used to form other organic molecules such as glucose) Oxygen is produced through this process The remaining G3P molecules that have exited the cycle are used to re-form RuBP through a series of chemical reactions, so that the Calvin cycle can continue. The enzyme Rubisco attaches to RuBP, causing the formation of molecules of 3-phosphoglycerate