a. light-dependent reaction b. carbon fixation reaction c. CAM pathway Photosystem I or PS I contains chlorophyll A-670, chlorophyll A-680, chlorophyll A-695, chlorophyll A-700, chlorophyll B, and carotenoids in the ratio of 20-30 :1, whereas in Photosystem II or PS 2 contains chlorophyll A-660, chlorophyll A-670, chlorophyll A-680, chlorophyll A-695, chlorophyll A-700, chlorophyll B, xanthophylls and phycobilins in the ratio of 3-7 :1. This system is involved in both cyclic photophosphorylation. But it was too late, the name stuck. In photosystem II, the electron comes from the splitting of water, which releases oxygen as a waste product. 7. 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. It involves the P700, chlorophyll and other pigments, while PS II is the complex that absorbs light energy, involving P680, chlorophyll and accessory pigments and … Photosystem I (PS I) and photosystem II (PS II) are two multi-subunit membrane-protein complexes involved in oxygenic photosynthesis. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. Difference # Photosystem II: 1. It is located on the inner surface of the thylakoid membrane. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? The overall structure of Photosystem II was found to be similar to that known from cyanobacteria. b. the light reactions only. It performs non-cyclic photophosphorylation in conjunction with photosystem I. These electrons are utilized in electron transport chains to generate a proton gradient across the membrane as well as NADPH. Photosystem II was discovered later. The red alga Cyanidioschyzon merolae is a primitive organism, which is capable of performing photosynthesis in extreme acidic and hot environments. Galka P, Santabarbara S, Thi THK et al (2012) Functional analyses of the plant photosystem I-light-harvesting complex II supercomplex reveal that light-harvesting complex II loosely bound to photosystem II is a very efficient antenna for photosystem I in state II. 8. What are the factors which induce heart failure? Photosystem II is the photosystem that generates the two electrons that will eventually reduce NADP + in ferredoxin-NADP-reductase. These complexes, photosystem II and photosystem I, capture light energy and act sequentially to raise the energy of electrons. Photosystem I and photosystem II take place during which part of photosynthesis? 4. The ratio of the chlorophyll carotenoid pigments. One part of the reaction is the reduction of NADP+ to NADPH, carried out by photosystem I (PSI). The structure of photosystem II is remarkably similar to the bacterial reaction center, and it is theorized that they share a common ancestor. c. the light reactions and the carbon reactions. It is located on the outer surface of the thylakoid membrane. Chlorophyll is the pigment involved in capturing light energy. It receives electrons from photosystem II. 6. The PS II is made up of two subunits made up of D1 and D2. Chlorophyll a content is more than twice that of chlorophyll b. PS 1 contains chlorophyll B, chlorophyll A-670, Chlorophyll A-680, chlorophyll A-695, chlorophyll A-700 and carotenoids. Photosystem II is the second photosystem to develop in most higher autotrophs. c. the carbon reaction and the light reactions. Later, photosystem II was discovered and found to be earlier in the electron transport chain. D. the carbon reactions only. How light energy is used to make ATP and NADPH. 3. 1. 6. 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