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photosystem ii produces

25/01/2021 — 0

A photosystem (or Reaction Center) is an enzyme which uses light to reduce molecules. As the accumulating protons in the thylakoid interior space pass back across the thylakoid membrane to the stroma through ATP synthetase complexes, this proton motive force is used to generate ATP from ADP and Pi. These electrons are used in several ways. The exergonic light-dependent reactions of photosynthesis convert light energy into chemical energy, producing ATP and NADPH. One has to note that both reaction center types are present in chloroplasts and cyanobacteria, working together to form a unique photosynthetic chain able to extract electrons from water, creating oxygen as a byproduct. The photons from light are captured through antennas and electrons are then extracted from water molecules. The photosystem I was named “I” as it was discovered before photosystem II. O2 - produced in Photosystem II when water splits. Photosynthesis is the means by which plants make use of chorophyll and light to produce energy. When photosystem II absorbs light, electrons in the reaction-center chlorophyll are excited to a higher energy level and are trapped by the primary electron acceptors. This chlorophyll absorbs best the light of 680nm. Photosystem II (PSII) is a specialized protein complex that uses light energy to drive the transfer of electrons from water to plastoquinone, resulting in the production of oxygen and the release of reduced plastoquinone into the photosynthetic membrane. PSI is composed of more than 110 cofactors, significantly more than Photosystem II. Photosystem II (PSII) is a membrane protein complex which functions to catalyze light-induced water oxidation in oxygenic photosynthesis. The photosystem II difficult and it replaced its lost electrons from an exterior source; however, the two other electrons are not returned to photosystem II as they would do in the cyclic pathway. The deficit is due to photo-excitation of electrons which are again trapped in an electron acceptor molecule, this time that of photosystem I. Photosystems are z shaped. During this process, Photosystem II splits molecules of H2O into 1/2 O2, 2H+, and 2 electrons. Photoexcited electrons travel through the cytochrome b6f complex to photosystem I via an electron transport chain set in the thylakoid membrane. Photosystem I: It has chlorophyll a molecules. Meanwhile, photons are also being absorbed by pigment molecules in the antenna complex of Photosystem I and excited electrons from the reaction center are picked up by the primary electron acceptor of the Photosystem I electron transport chain. The combined action of the entire photosynthetic electron transport chain also produces a proton-motive force that is used to generate ATP. (2) During this process, ATP is generated by the Photosystem II electron transport chain and chemiosmosis. Photosystem I (PS I) and photosystem II (PS II) are two multi-subunit membrane-protein complexes involved in oxygenic photosynthesis. This splits the water molecule, generating oxygen and hydrogen ions. Photons are absorbed by chlorophyll and accessory pigments and that energy is eventually transfered to the reaction center where it is absorbed by an excitable electron moving it to a higher energy level. 4.Photosystem I is sensitive to light wavelengths of 700 nm while photosystem II is sensitive to light wavelengths of 680 nm. These electrons may either continue to go through cyclic electron transport around PS I, or pass, via ferredoxin, to the enzyme NADP+ reductase. Cyclic photophosphorylation occurs less commonly in plants than noncyclic photophosphorylation, most likely occurring when there is too little NADP+ available. Its oxygen-evolving complex (OEC) sequentially advances from its most reduced state (S 0 ), through four photon-driven oxidations, to its most oxidized state (S 4 ), which produces O 2 . Photosystem I finally produces just NADPH through another electron transport chain. Photosystem I is a necessary layer protein complex that utilizations light energy to deliver the high energy transporters ATP and NADPH Photosystem II. The photogeneration of hydroxyl radicals (OH•) in photosystem II (PSII) membranes was studied using EPR spin-trapping spectroscopy. The unicellular halotolerant cyanobacteriumAphanothece halophytica is a potential dark fermentative producer of molecular hydrogen (H2) that produces very little H2 under illumination. 2. Solution for When photosystem I produces NADPH, its reaction center P700 chlorophyll a loses electrons. I. Autotrophs and Heterotrophs A. Autotrophs: produce their own food.. B. Heterotrophs: cannot make their own food thus they have to consume food made by autotrophs. In protest, Girl Scouts across U.S. boycotting cookie season, Ex-Michigan State basketball player is now worth billions, Jim Carrey mocks Melania Trump in new painting, Tony Jones, 2-time Super Bowl champion, dies at 54, UFC 257: Poirier shocks McGregor with brutal finish, 'A menace to our country': GOP rep under intense fire, Larry King, veteran TV and radio host, dies at 87, Biden’s executive order will put 'a huge dent' in food crisis, Filming twisty thriller was no day at the office for actor, FBI: Capitol riot suspect tweeted 'Assassinate AOC'. Ultimately, the electrons that are transferred by Photosystem I are used to produce the high energy carrier NADPH. A. Photosynthesis: process by which autotrophs make carbohydrates using light energy, carbon dioxide (CO 2) and water (H 2 O)and release oxygen (O 2) as a waste … They are found in the thylakoid membranes of plants, algae and cyanobacteria (in plants and algae these are located in the chloroplasts), or in the cytoplasmic membrane of photosynthetic bacteria. Photosystem II or PS II can define as the light-dependent photosystem that participates in the photosynthetic light reactions. Through the water-splitting reaction of PSII, light energy is converted into biologically useful chemical energy, and molecular oxygen is formed which transformed the atmosphere into an aerobic one and sustained aerobic life on the Earth. 1. 2.Photosystem II produces ATP while photosystem I produces NADPH. 3.Photosystem I was discovered before photosystem II. Introducing: Photosystem II Photosynthesis is the means by which plants make use of chorophyll and light to produce energy. It is also seen in certain photosynthetic bacteria. Photosystem II (PSII) uses visible light to oxidize water and release O 2. Photosystem II - YouTube. We will now look at Photosystems I and II and their roles in noncyclic photophosphorylation. When photosystem II replaces two electrons that it excited and ejected, it uses_____ and produces _____. The products of the light-dependent reactions, ATP and NADPH, are both required for the endergonic light-independent reactions. When the electron reaches photosystem I, it fills the electron deficit of the reaction-center chlorophyll of photosystem I. Both ATP and NADPH are used in the production of glucose from carbon dioxide taken from the atmosphere during the subsequent light independant reactions. Photosystem lI: lt has photosystem ii produces chlorophyll a molecules in the photosynthetic electron transport chain and chemiosmosis I... 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