This system induces the continuous transfer of electrons through the light-absorbing molecules generally called chromophores (pigments), such as pheophytin, quinones, and chlorophyll. There are other forms of plastoquinone, such as ones with shorter side chains like PQ-3 (which has 3 isoprenyl side units instead of 9) as well as analogs such as PQ-B, PQ-C, and PQ-D, which differ in their side chains. The key difference between plastoquinone and plastocyanin is that plastoquinone is a lipophilic carrier molecule that transfers electrons to plastocyanin through cytochrome b6f protein complex. 1)Photo II absorbs light and energy which causes the P680 molecule to excite its e- and pass it onto an enzyme called plastoquinone. It uses the energy of sunlight to transfer electrons from water to a mobile electron carrier in the membrane called plastoquinone: H 2 O → P680 → P680 * → plastoquinone. Light of shorter wavelength (such as blue) has more energy than light of longer wavelength (such as red), so absorption of blue light creates an excited state of higher energy. No part of the Test Booklet and Answer Sheet shall be detached under any circumstances. In light reaction,plastoquinone facilitates the transfer of electrons from : The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of : The enzyme enterokinase helps in conversion of : Choose the correct pair from the following : (1) Exonucleases : Make cuts at specific positions within DNA. All cases of unfair means will be dealt with as per Rules and Regulations of this. The photosynthetic pigments absorb the sunlight. The steps of N.C. P.P. Light reaction II leads to the oxidation of water, thus evolving oxygen (left bottom, Fig. C) The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP. In PSII, DCMU inhibits oxygen evolution and also inhibits the reduction of cytochrome ƒ by light of shorter wavelength. In Photosystem I, what provides the energy necessary to transfer an electron from the P700 reaction center to the primary acceptor of PS 1? Plastoquinone, in turn, transfers electrons to cyt b 6 f, which feeds them into PS I. The pool of intermediate carriers may receive electrons from water via light reaction II and the quinones. The cytochrome complex, an enzyme composed of two protein complexes, transfers the electrons from the carrier molecule plastoquinone (Pq) to the protein plastocyanin (Pc), thus enabling both the transfer of protons across the thylakoid membrane and the transfer of electrons from PSII to PSI. The light-saturated rate of photosynthetic O2 evolution in Chlamydomonas reinhardtii declined by approximately 75% on a per-cell basis after 4 d of P starvation or 1 d of S starvation. - [Voiceover] In a previous video, we gave an overview of the light dependent reactions which are essentially occurring across the thyla or within or across the thylakoid membranes, right that we zoomed in on one and we saw okay we have some energy from light exciting the electrons within that chlorophyll pair, that P680 chlorophylled A pair. Find answers and explanations to over 1.2 million textbook exercises. Due to the higher midpoint potential of plastoquinone in the Q A site than Pheo − the charge-separated state is stabilized, reducing the probability of a back reaction between Q A − and P680 +. The ben… Photosystem II (PSII) functions to capture light energy and transfer it to plastoquinone, the first molecule in an electron transport chain that leads to the production of ATP. copy number of the linked DNA in the vector. The reaction center chlorophyll contains electrons that can be transferred when excited. In oxygenic photosynthesis, photosystem II is the chlorophyll-containing reaction center that carries out the light-induced transfer of electrons from water to plastoquinone. 16. The sunlight is transferred to the light-harvesting system found in the chloroplast. Can you explain this answer? The reaction center of PSII (called P680) delivers its high-energy electrons, one at the time, to the primary electron … Once excited, two electrons are transferred to plastoquinone Qb, the first mobile carrier. Once excited, two electrons are transferred to plastoquinone Qb, the first mobile carrier. In addition to the two electrons, Qb also picks up two protons from the stroma. The light excites an electron from the chlorophyll a pair, which passes to the primary electron acceptor. light-reactions - 4 stages primary photoevent - light photon captured by pigment, exciting the electrons in the pigment; charge separation - energy transferred to reaction center (special chlorophyll pigment) transfers energetic electron to acceptor molecule, starts electron transport As plastoquinone reduces the cytochrome b6f complex, the two protons it was carrying are released into the lumen. Therefore plastoquinone facilitates the transfer of electrons from PS-II to Cyt b 6f complex. One photon is needed to excite each of the electrons in this chlorophyll. Each photosystem is composed of two parts. This sunlight drives the process of photosynthesis.   Privacy Plastoquinone (PQ) is an isoprenoid quinone molecule involved in the electron transport chain in the light-dependent reactions of photosynthesis. Photosynthetic pigments are organized into clusters called photosystems. Try our expert-verified textbook solutions with step-by-step explanations. In light reaction, plastoquinone facilitates the transfer of electrons from (1) Cytb 6f complex to PS-I (2) PS-I to NADP+ (3) PS-I to ATP synthase (4) PS-II to Cytb 6f complex Answer (4) Sol. Fourier transform infrared spectroscopy can be used to obtain information about the structural changes that accompany electron transfer in photosystem II. The cytochrome complex, an enzyme composed of two protein complexes, transfers the electrons from the carrier molecule plastoquinone (Pq) to the protein plastocyanin (Pc), thus enabling both the transfer of protons across the thylakoid membrane and the transfer of electrons from PSII to PSI. But, plastocyanin is a small water-soluble blue-copper protein that accepts a pair of electrons from the cytochrome b 6 f complex and passes it to photosystem I in the thylakoid space. The candidates are governed by all Rules and Regulations of the examination with regard to their conduct, in the Examination Hall. | EduRev NEET Question is disucussed on EduRev Study Group by 128 NEET Students. The water-splitting complex. This preview shows page 1 - 3 out of 33 pages. Photoreaction I transfer electrons Pigments in the light-harvesting complex pass light energy to two special chlorophyll a molecules in the reaction center. Q10. 1), and the transfer of electrons from the water to an intermediate pool between Photosystem II and Photosystem I (middle Fig. How Light-Dependent Reactions Work. The overall function of light-dependent reactions, the first stage of photosynthesis, is to convert solar energy into chemical energy in the form of NADPH and ATP, which are used in light-independent reactions and fuel the assembly of sugar molecules. 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