1). One photon is needed to excite each of the electrons in this chlorophyll. In gel electrophoresis, separated DNA fragments can be visualized with the help of . 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. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. The maximum marks are. The reaction center chlorophyll contains electrons that can be transferred when excited. Light energy absorbed by the antenna complex is transferred to reaction … B) The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the cycle provides water and electrons to the light reactions. Ans: In the light reaction within the chloroplast, protons in the stroma decrease in number, while in the lumen there is accumulation of protons. 16. Use of Electronic/Manual Calculator is prohibited. The water-splitting complex. After excitement, e – is passed from PS-II (P 680 ) to primary electron acceptor (Pheophytin). The reaction center of PSII (called P680) delivers its high-energy electrons, one at the time, to the primary electron … The correct option is (4) because Ori Plastoquinone (PQ) in turn transfer its e– to Cyt b 6f complex. Therefore plastoquinone facilitates the transfer of electrons from PS-II to Cyt b 6f complex. The electrons are transferred (by way of plastoquinone — PQ in the figure) to the cytochrome b 6 /f complex where they provide the energy for chemiosmosis. Pigments in the light-harvesting complex pass light energy to two special chlorophyll a molecules in the reaction center. C water C plastoquinone (Pq) C plastocyanin (PC) C ATP C ferredoxin (Fd) light In light reaction I, P 700 + recovers electrons from plastocyanin, which in turn receives them from intermediate carriers, including the plastoquinone pool and cytochrome b and cytochrome f molecules. 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. Explain how during light reaction of photosynthesis, ATP synthesis is a chemiosmotic phenomenon. This system induces the continuous transfer of electrons through the light-absorbing molecules generally called chromophores (pigments), such as pheophytin, quinones, and chlorophyll. 1 answer. Bottom: schematic of the photosynthetic transfer chain in the thylakoid (Th) membrane of kleptoplasts in E. timida sea slugs. 1)Photo II absorbs light and energy which causes the P680 molecule to excite its e- and pass it onto an enzyme called plastoquinone. This sunlight drives the process of photosynthesis. 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. Once excited, two electrons are transferred to plastoquinone Qb, the first mobile carrier. The light excites an electron from the chlorophyll a pair, which passes to the primary electron acceptor. No candidate, without special permission of the Superintendent or Invigilator, would leave his/her seat. Course Hero, Inc. The steps of N.C. P.P. Facilitates the movement of electrons AND protons Passes electrons linearly to plastocyanin Passes electrons cyclically to force protons (removed from PQH2) into the lumen of the thylakoid to create a electrochemical gradient across the lumen and stroma Is ditributed evenly between PSI and II Course Hero is not sponsored or endorsed by any college or university. 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 +. Each candidate must show on demand his/her Admission Card to the Invigilator. Fourier transform infrared spectroscopy can be used to obtain information about the structural changes that accompany electron transfer in photosystem II. Light reaction II leads to the oxidation of water, thus evolving oxygen (left bottom, Fig. 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. Rough work is to be done on the space provided for this purpose in the Test Booklet only. Can you explain this answer? These photosystems absorb and utilize the solar energy efficiently in the thylakoid membranes. Jan 07,2021 - In light reaction, plastoquinone facilitates the transfer of electrons from:a)PS-I to NADP+b)PS-I to ATP synthasec)PS-II to Cytb6f complexd)Cytb6complex to PS-ICorrect answer is option 'C'. The most common form of plastoquinone, known as PQ-A or PQ-9, is a 2,3-dimethyl-1,4-benzoquinone molecule with a side chain of nine isoprenylunits. The specific palindromic sequence which is, The correct option is (3) because the specific, palindromic sequence which is recognised by. 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. Plastoquinone (PQ) is an isoprenoid quinone molecule involved in the electron transport chain in the light-dependent reactions of photosynthesis. One photon is needed to excite each of the electrons in this chlorophyll. Ans_Solutions_NEET2020_(Code-F1).pdf - Test Booklet Code DATE F1 KANHA Regd Office Aakash Tower 8 Pusa Road New Delhi-110005 Ph 011-47623456 Time 3 hrs, marks. anywhere else except in the specified space in the Test. 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 step H The occurrence of two separate light reactions. 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