AP Biology Study

AP Biology Study - Releasing oxygen for photorespiration is...

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Releasing oxygen for photorespiration is not a useful function of light reactions. Synthesis of ATP by chemiosmotic mechanism occurs during photosynthesis and respiration. The three substrates (formal reactants) for the enzyme RuBP carboxylase (oxidase rubisco) are Carbon dioxide, oxygen gas, and RuBP. Photosynthesis stores energy in complex organic molecules and respiration releases it. The products of the Calvin cycle which is also utilizied Photorespiration releases ribulose phosphate molecules Calvin cycle forms proton gradient Photosystem II splits water into oxygen. The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi and NADP + to the light reaction Oxidation of water occurs during photosynthesis In thylakoid membranes, main role of antenna pigment molecules is to harvest photons and transfer light energy to the reaction center chlorophyll. The generation of proton gradients across membranes occurs during respiration and photosynthesis. Calvin cycle requires ATP. Reactions of Calvin Cycle requires ATP, NADPH, Carbon Dioxide, and RuBP. Primary function of light-reactions of photosynthesis is to make ATP and NADPH. Light reaction produces oxygen. Photophosphorylation is not directly associated with Photosystem II. In c4 plants, carbon fixation takes place in mesophyll. The acid is then transferred to the bundle-sheath cells where carbon dioxide is released for entry into the Calvin cycle. Photosynthesis stores energy in complex organic molecules and respiration releases it In plant cells, ATP is made in response to light. An electron transport chain is involved. This electron transport chain is found in the thylakoid membranes of chloroplast. Calvin cycle and light-reactions inactive in the dark. Oxidative phosphorylation in mitochondria and photophosphorylation in chloroplasts produce ATP in plants In mitochondria, chemiosmosis translocates protons from the matrix into the intermembrane space whereas in chloroplasts, chemiosmosis translocates protons from the stroma into the thylakoid compartment Oxidative Phosphorylation occurs during respiration Reduction of NADP+ occurs during photosynthesis Calvin cycle takes place in the stroma of the chloroplast. In a plant cell, ATP synthase is located Calvin cycle requires carbon dioxide. If puncture and thylakoid no longer separated from stroma, affects synthesis of ATP. CAM plants differ from C4 because they incorporate Carbon dioxide into organic acids at night. RuBP carboxylas/oxygenase –most abundant protein in the world. Oxidative phosphorylation in mitochrondia and photorespiration in chloroplast produce ATP in plants. Chemiostic process in chloroplasts involve proton gradient.
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This note was uploaded on 04/30/2010 for the course BIOL 203 taught by Professor Hued during the Spring '10 term at Eastern Oregon.

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AP Biology Study - Releasing oxygen for photorespiration is...

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