By liberating oxygen, consuming carbon dioxide, and generating biological sources of en- Photosystem II occurs with two series of enzymes followed by Photosystem I in order to create energy for a plant1. a) a collection of hydrogen-pumping proteins b) a collection of photosynthetic pigments arranged in a thylakjoid membrane c) a series of electron-accepting proteins arranged in the thylakoid membrane d. found only in prokaryotic organisms e) multiple copies of chlorophyll a located in the stroma of the chloroplast The electrons received by plastocyanin (pC) have more energy than the Where do the photosystems play a role? Photosystem I is very receptive to light waves at the 700 nm wavelength. Photosystem II has a special, oxidizable chlorophyll At the core of the PS II reaction center lie a special pair of chlorophyll molecules. c. Each photosystem contains numerious pigment molecules that act as antennas to capture light. acts as an electron carrier between the cytochrome b6f and photosystem 1 (PS1) complexes in the photosynthetic electron-transfer chain. Term. Light Independent Reaction by Hannah & Judi 6. NADPH and ATP are used to reduce CO 2 to carbohydrates in the subsequent dark reactions. One of these, designated P680 for it's characteristic spectral properties, is the chlorophyll that actually undergoes oxidation during photosynthetic electron transport. Finally, the hydrogen ions (H+) inside the thylakoid pass back to the stroma (3 at a time) supplying the energy to produce ATP via chemiosmosis. It captures photons and uses the energy to extract electrons from water molecules. Other articles where Photosystem I is discussed: bacteria: Phototrophic metabolism: The photosystem in green bacteria is related to photosystem I of higher plants, whereas that in purple bacteria is related to photosystem II, which provides some indication of an evolutionary trail from bacteria to plants (see photosynthesis: The process of photosynthesis: the light reactions). Definition. Both photosystem (PS I and PS II) are affected by light with wavelengths shorter than 680nm (nanometer), while photosystem I is affected by light with wavelengths longer than 680nm. ATP,O2 and NADPH are the products. Choose from 364 different sets of photosystems flashcards on Quizlet. Kevin E. Redding, in The Chlamydomonas Sourcebook, 2009. Reactants - light, water. An integral memb…. Ferredoxin then "hands" the electron to NADP which then adds a H+ from the stroma to form NADPH. The oxidized chlorophyll is now a very strong oxidizing agent; its electron “hole” must be filled. ... OTHER QUIZLET SETS. The difference between Photosystem I and Photosystem II is primarily due to the following factors: Active reaction centre: P700 is the active reaction centre of PS-I, while P680 is the active reaction centre of PS-II. Light Reactions: Photosystem I & II . Learn vocabulary, terms, and more with flashcards, games, and other study tools. P700) p197, What is "C" pointing to?, NADP+ (NADPH) p197, What is the final electron receptor in the light reaction of photosynthesis? d. electrons in the reaction center molecule are excited by absorbed solar energy and are passed along to an acceptor molecule. Photosystem 1 (PS1) also uses the photons to excite an (e-) from its antenna molecule p700. Chlorophyll is the pigment involved in capturing light energy. In comparison, photosystem II is very receptive to light wavelengths of around 680 nm. What are the reactants and products of the light dependent reaction? 4. Term. I have to have a complete and full understanding of this...What are some differences between photosystem II and I? What does it mean to say that photosystem II “splits” water? Photosystem I is a large multi-subunit protein complex, embedded into the photosynthetic thylakoid membrane. It is because the stripping electrons from water require more energy than light-activated photosystem I can supply. Start studying Chapter 8- Photosynthesis. Light Dependent Reaction Light energy --> Chemical energy (ATP) 2. Learn photosystem 1 with free interactive flashcards. These electrons are used in several ways. Main Difference – Photosystem 1 vs 2. Step 4 Step 3 After the sunlight goes through the plant Function of photosystem I. Photosystem I (PS I) is a chlorophyll (Chl)–protein complex that functions as a light-driven plastocyanin:ferredoxin oxidoreductase. Step 1 Step 2 The leaf of a plant needs sunlight to make energy. A.- both involve the spitting of water to donate an electron to the reaction center B.- both involve the generation of oxygen C.- both lose an electron to a primary electron acceptor that passes the electron down an electron transport chain leading to the generation of ATP D.- both contain a reaction center composed of chlorophyll a E.- both are found in the stroma After the sunlight hits the surface of the leaf it goes into the plant cell. The photoexcited electrons pass from photosystem II to photosystem I via an electron transport chain and their fall provides energy for ATP synthesis. This electron that is captured by its electron receptor Ferredoxin. A. water is reduced to yield H2 gas B. a condensation reaction occurs C. water is broken into monomers D. water is oxidized to yield H+, electrons, and O2 2. e. only photosystem I is involved in the cyclic electron pathway. PS 1 contains chlorophyll B, chlorophyll A-670, Chlorophyll A-680, chlorophyll A-695, chlorophyll A-700 and carotenoids. 5. 23. Non-Cyclic vs. Cyclic Photophosphorylation Photosystems I & II IB11 HL Biology Overview of Photosynthesis: Steps: 1. Products - oxygen, ATP, NADPH. Chlorophyll a and b absorb light in the thylakoid mostly blue, red, and orange. Photosystem 1 (PS1) also uses the photons to excite an (e-) from its antenna molecule p700. This electron that is captured by its electron receptor Ferredoxin. Cellular respiration is controlled by: biphosphate glycolysis 3. Photosystem I’ Parag R. Chitnis** Division of Biology, Kansas State University, Manhattan, Kansas 66506-4901 Plants harvest light energy by oxygenic photosynthesis, which is undoubtedly one of the most important biological processes on the earth. Learn vocabulary, terms, and more with flashcards, games, and other study tools. A. Definition. 1. NADP+ (In cellular respiration, it is oxygen. Photosystem II (PSII) is a membrane protein complex which functions to catalyze light-induced water oxidation in oxygenic photosynthesis. Learn photosystems with free interactive flashcards. Photosynthesis - Photosynthesis - Photosystems I and II: The structural and photochemical properties of the minimum particles capable of performing light reactions I and II have received much study. (Please as much detail as you can think of. What is the difference between photosystem I and II? bc. Which phase of the light dependent reaction occurs first? Photosystem I or PS I and Photosystem II or PS II are the protein-mediated complex, and the main aim is to produce energy (ATP and NADPH2), which is used in Calvin cycle, the PSI uses light energy to convert NADP+ to NADPH2. Since PS1 lacks the enzyme to split water, the electron from quinone is releases into through the electron transport system or cytochrome shuttle to the thylakoid compartment where it will be used to replace an electron lost by photosystem 1, the hydrogen ions (H+) will also be moved into the thylakoid compartment where it will help establish the hydrogen ion gradient need to produce ATP. Where does the light dependent reaction occur? Photosystem II is the first link in the chain of photosynthesis. Photosystem I (PSI, or plastocyanin-ferredoxin oxidoreductase) is one of two photosystems in the photosynthetic light reactions of algae, plants, and cyanobacteria. When the electrons fall, the energy they lose allow the pumping of H+ from stroma intoo thylakoid space, creating an electrical and concentration gradient. 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