which statement about rubisco is true?

References C O 2 is fixed twice in the process of photosynthesis. Wheat, roses, and rice are examples of C3 plants Plant cellular respiration occurs All the time In noncyclic photophosphorylation, electrons flow in a one-way path from water to NADP+. All of the following statements are correct regarding the light-independent (dark) reactions of photosynthesis EXCEPT. Which statement about rubisco is true? C) it is found in the chloroplast stroma. …. In the C 4 cycle the first stable compound is 4 C compound called as oxaloacetic acid. RubisCO is inhibited by several hexose phosphates and by 3-phosphoglycerate, which all bind to the active site instead of RuBP. Which statement about light is true? (a) The C 4 - plants do not have RUBISCO (b) Carboxylation of RuBP leds to the formation of PGA and phosphoglycolate (c) Carboxylation of phosphoenolpyruvate results in the formation of C 4 - acids (d) Decarboxylation of C 4 - acids occurs in the mesophyll cells C) it is found in the Calvin cycle. All are correct statements about rubisco EXCEPT: A) ribulose-1,5-bisphosphate and carbon dioxide are both substrates. This phase is the carboxylation phase where RuBisCo catalyzes the attachment of a carbon dioxide molecule to a sugar called ribulose to from a 6-carbon intermediate. Solution for Which of the following is true about C4 photosynthesis Rubisco is not exposed to O2 as in C3 plants all of the answers spatial separation of C3 and… Choose the correct statement. C4 plants use this 4-carbon compound to effectively "concentrate" CO2 around rubisco, so that rubisco is less likely re react with O2. Short answerD. The figure represents the amount of rubisco present, the synthesis of rubisco and the breakdown of rubisco as the leaf ages. Krebs cycle occurs in aerobic organisms. iv. O Pseudogenes are found in multiple copies in order to maximize the production of the gene product. Q. Photosynthesis can be divided into two steps: the light-dependent reactions and the Calvin cycle. D) It catalyzes the addition of CO 2 to ribose. (C) Metabolism provides a mechanism for the production of energy. D) it releases two molecules of glyceraldehyde-3-phosphate as products. 3PGA goes on into the second phase of the Calvin cycle called the reduction phase. Light-independent reactions requires carbon dioxide ( A ) Light-independent reactions produce carbohydrates. The correct statements about light-independent reactions in photosynthesis are :. Some plants that live in hot, dry climates maintain low oxygen levels in their leaves by keeping the stomata closed to prevent water loss. answer choices. A) . Ans. It splits water b. Which of the following statements is true? In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue. C. Lose some or all of their normal activity when their 3-D structure is disrupted. This discussion on Which of the following statements concerning RuBisCO are true.a)RuBisCO is an enzyme.b)RuBisCO catalyses both the beginning steps of photorespiration and the Calvin- Benson cycle.c)RuBisCO is the most abundant protein on earth.d)All of the aboveCorrect answer is option 'D'. regeneration phase as RUBP is made during calvin cycle. We review their content and use your feedback to keep the quality high. B. c . C O 2 is fixed only once in the process of photosynthesis. Which statement regarding light is NOT true? Alcoholic Fermentation produces CO2 , Lactic fermentation does not (So Option A is wrong). Correct option is. a) The Calvin cycle is a metabolic pathway by which plants convert CO2 into pentose sugars as the main product. PHOTOSYNTHESIS Table of Contents What is Photosynthesis? Carbon dioxide enters the plants via stomata. Answer. (b). Ribulose-1,5-bisphosphate carboxylase-oxygenase, commonly known by the abbreviations RuBisCo, rubisco, RuBPCase, or RuBPco, is an enzyme involved in the first major step of carbon fixation, a process by which atmospheric carbon dioxide is converted by plants and other photosynthetic organisms to energy-rich molecules such as glucose. b. the catalytic site has both carboxylase and oxygenase activity. ATP and NADPH are produced in the light reactions of photosynthesis. e. A very strong inhibitor is 2-carboxyarabinitol 1-phosphate (CA1P) (Fig. Learn more: MCQ on Photosynthesis Practice Test . c) In the Calvin cycle rubisco adds CO2 to 3-phosphoglycerate. Are made up of a base containing nitrogen, phosphate, and ribose. asked Jun 29, 2019 in Biology by Aarush (69.8k points) Which of the following statements concerning rubisco are true. RuBP carboxylase (Rubisco) is used in these plants. C. Sucrose is a disaccharide. 34. If the light is switched off, this statement is simply not true. b. CO 2 is taken in, and water and O 2 are released through stomata. What is a false statement with regards to the Calvin cycle? Which of the following statements about the dark reaction is true? The Calvin cycle has three stages. WINDOWPANE is the live-streaming social network, and multi-media app, for recording and sharing your amazing life. E. True for C 3, C 4, AND CAM PLANTS. Question. An enzyme, RuBisCO, catalyzes a reaction with CO 2 and another molecule, RuBP. Which of the following statements about the dark reaction is true? These Photosynthesis short Objective Questions with Answers are useful for competitive exams UGC NET, SSC, NEET etc. b. c3 carbon fixation occurs in more plants than c4 carbon fixation. Assertion Carbohydrates are more suitable for the production of energy in the body than proteins and fats. CO 2 fixation is fast and more efficient. It produces ATP and CO2. C 4 is the alternative pathway of Calvin cycle (C 3 cycle) taking place during the dark phase of photosynthesis. Using the energy carriers formed in the first steps of photosynthesis, the light-independent reactions, or the Calvin cycle, take in CO 2 from the environment. D ) It catalyzes the addition of CO 2 to ribose . Have activity that is independent of temperature and pH. O All sequences of a pseudogene and its functional counterpart are different. Mesophyll cells have PEP case enzyme that fixes C O 2 into C 4 acid. As a leaf ages, the ribulose bisphosphate carboxylase (rubisco) content of the leaf changes. a. In C4 plants, spatial separation of carbon dioxide fixation and RUBISCO activity in mesophyll and bundle sheath cells of C 4. . Yeah, A false statement with regards to the Calvin cycle is the concentration of three pg rises. It is extremely scarce on Earth. An absorption spectrum may be a good means of identifying a pigment. B) Initial carboxylation reaction occurs in the bundle sheath cell. Is correct, as Rubisco catalyzes the carboxylation, or oxygenation reaction depending upon the molecular concentration of CO 2 or O 2 (Sudhakar et al ., 2016). d. A given kind of molecule can occupy any energy level. The energy source utilized is the ATP and NADPH obtained through the light reaction. . C4 plants use this 4-carbon compound to effectively "concentrate" CO2 around rubisco, so that rubisco is less likely re react with O2. a. the conversion of $\mathrm{CO}_{2}$ into an organic compound b. the use of RuBisco to form 3-PGA c. the production of carbohydrate molecules from G3P d. the formation of RuBP from G3P molecules e. the use of ATP and NADPH to reduce CO2 An enzyme known as rubisco enables plants to use large amounts of carbon dioxide. Is correct, as it is the most abundant enzyme on land, and probably also in marine environments (Raven, 2013). d. Rubisco catalyzes the splitting in water to release O 2. e. Rubisco is only found in a few plant species. There are two important adaptations . The true statement about fermentation is : both alcoholic and lactate fermentation regenarate NAD+ (Option B) as in both cases NADH is converted into NAD+. Transcribed image text: QUESTION 23 Which statement is true regarding the linear electron transport used in photosynthesis? Choose the correct statements. Select the correct statement from the following: (A) Biomolecules are in metabolic flux in living state. C. It generates a six-carbon molecule that splits into two molecules of 3PG. carbon fixation when CO2 is connected to RUBP during calvin cycle. c. stroma/rubisco d. thylakoids/light harvest e. thylakoids/electron transport 37) Both cyclic and noncyclic electron transport in chloroplasts_____. c) it is a carbohydrate d) it is the second enzyme in the calvin cycle e) it is extremely scarce on earth. (a) Rubisco is an enzyme (b) Rubisco catalyzes both the beginning steps of photo respiration and the Calvin-Benson cycle. energizing the electrons in chlorophyll. C) it is found in the chloroplast stroma. e. 19. Two molecules are produced: a three-carbon compound, 3-PGA, and a two-carbon compound, phosphoglycolate. c. c3 carbon fixation is more common in areas of high temperatures than c4 carbon fixation. In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue. b) They are involved in cell movement. The dark reactions of the C 3 cycle utilize the energy from short-lived electronically excited carriers to convert CO 2 & H 2 O into glucose catalyzed by the enzyme RuBisCo, and this constitutes carbon fixation and makes it the enzymatic phase. It splits lipids c. It produces FADH+ d. It occurs in the cytoplasm e. It makes the most ATP compared to the two other steps D. It occurs in the cytoplasm 19 iii. C O 2 can be fixed even in very low concentrations during photosynthesis. B. the reactions occur in the chloroplast stroma. Oxygen gas is produced in the thylakoid lumen by the oxidation of water by photosystem I. Ferrodoxin and NADP+ reductase participates in the reduction of NADP+ to NADPH. Dark Reaction | C-4 Pathway | The Carbon Cycle | Learning Objectives | Terms | Review Questions | Links . B) it is one of the most prevalent proteins on Earth. C4 plants have a special leaf anatomy, with prominent bundle sheath cells surrounding the leaf veins. So, it is called as C 4 cycle. B) the catalytic site has both carboxylase and oxygenase activity. Light need not be absorbed to produce a biological effect. c) Their basic structure is a globular head and long alpha helical tail. In stage 2, the organic molecule is reduced using electrons supplied by NADPH. A. ribulose-1,5-bisphosphate carboxylase, or RUBISCO is the CO2-fixing enzyme for this process. A. CO2 reacts with RuBP to form 3PG. Photorespiration begins in the chloroplast, when rubisco attaches to RuBP in its oxygenase reaction. b. Rubisco preferentially binds to O 2 over CO 2. c. Rubisco is absent from C 4 and CAM plants. However, Calvin cycle takes place only in plants. B. Which of the following statements concerning rubisco is true? c) I and II. The Calvin cycle is also known as the light independent reaction. D. Cellulose is a polysaccharide. In stage 1, the enzyme RuBisCO incorporates carbon dioxide into an organic molecule, 3-PGA. The flaws in the 3 cycle leads to Photorespiration which is less energy efficient. In stage 1, the enzyme RuBisCO incorporates carbon dioxide into an organic molecule. Most importantly, it occurs in the presence of oxygen. A. Metabolic pathways are somewhat like roadways: A metabolic path may be one-way or two-way. A. C3 plants are more successful in mild climates B. C4 plants contain chloroplasts only in part of their mesophyll cells C. C3 plants fix CO2 in the mesophyll cells D. C3 plants make glucose in the bundle of sheath cells . Which statement regarding light is NOT true? It generates a six-carbon molecule that splits into two molecules of 3PG. D. Provide the activation energy needed to activate a reaction. III. E. Rubisco catalyzes the reaction of CO2 and RuBP. Using the energy carriers formed in the first steps of photosynthesis, the light-independent reactions, or the Calvin cycle, take in CO 2 from the environment. How are Krebs and Calvin cycle similar? Which of the following statements is true about the intermediate filaments. Here, decarboxylation occurs producing C 3 acid and O 2. C. the ATP and NADPH required for this process are produced by the light reactions of photosynthesis. b) Photorespiration results from the efficient catalytic properties of ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) in being able to catalyze two different reactions. d) They resemble CAM plants in that they keep their stomata closed during the day. Photosynthesis Multiple Choice Questions & Answers important for competitive exams. Answer. A. These plants are called C4 plants, because the first product of carbon fixation is a 4-carbon compound (instead of a 3-carbon compound as in C3 or "normal" plants). To get adequate CO 2 for photosynthesis, C4 plants have adapted to photorespiration by modifying the Calvin-Benson cycle. All the above statements are true. Photorespiration is influenced by high temperature as well as light intensity and accelerating the . It generates a six-carbon molecule that splits into two molecules of 3PG. . Which of the following statements about c3 carbon fixation is true? b) They require more ATP to produce glucose than C3 plants. Which of the following is true regarding these two steps? Ribulose biosphospate carboxylase (rubisco) Which statement is NOT true about C3 and C4 plants? 13. What statement about photosynthesis is true? A. RUBISCO is a an enzyme required for carbon dioxide fixation. a. The light-dependent reactions take place in the . The rubisco enzyme that carries out 3 cycle is equal affinity to Oxygen. Which statement about carbohydrate biosynthesis during the dark reactions of photosynthesis (i.e. In stage 2, the organic molecule is reduced. ii. Starch molecules present in a maple tree are made from materials that originally entered the tree from the external environment as A. enzymes B. simple sugars Stomata open at night to allow CO 2 to enter, but close during the day. (D) Living state and metabolism is synonymous. reduction of the carbon chain during the calvin cycle. e. All the O 2 gas produced during photosynthesis comes from water. 1. A) Rubisco is an important enzyme in the light reactions of photosynthesis B) Rubisco creates a proton gradient from which ATP is formed C) Rubisco is an important enzyme in aerobic respiration D) Rubisco is a very slow enzyme E) Rubisco works at it's maximum rate at current air levels of CO2 Highly repetitive sequences ( 3PG ) molecules: a metabolic path may be up... 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Use ATP from the efficient catalytic properties of ribulose-1,5-bisphosphate carboxylase/oxygenase ( rubisco ) the... C-4 pathway | the carbon cycle | Learning Objectives | Terms | Review Questions | Links ) their basic is. Intensity and accelerating the stage 2, the enzyme rubisco incorporates carbon dioxide are both substrates more in... Cycle rubisco adds CO2 to 3-phosphoglycerate intermediate to make bigp and ATP must convert ADP... Stage 2, the organic molecule is reduced fixed even in very low concentrations during photosynthesis,. To make organic molecules - Biology < /a > which of the most prevalent proteins on Earth, it. Steps of photo respiration and the Calvin-Benson cycle compound is 4 C compound as.
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