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C. Both use electron transport. d. synthesis of G3P. An absorption spectrum may be a good means of identifying a pigment. 45 seconds . C. Ribulose bisphosphate (RuBP) reacts with CO2. Which statement about chlorophylls is not true? E. Non-cyclic electron transport is not coupled to ATP synthesis. The proton gradient is used to reduce NADP. A. excite chlorophyll. ATP. it uses ATP from noncyclic but not cyclic photophosphorylation. false. C. light causes the thylakoid lumen to become less acidic than the stroma. In plants, carbon dioxide (CO 2) enters the leaves through stomata, where it diffuses over short distances through intercellular spaces until it reaches the mesophyll cells.Once in the mesophyll cells, CO 2 diffuses into the stroma of the chloroplast, the site of light-independent reactions of photosynthesis. More than one statement is FALSE b. a. C. 6 CO2 + 6 H2O --> C6H12O6 + 6 O2 Which of the following statements is FALSE? C. Oxygen is produced by thylakoid membranes. B. ATP forms. Thus, of six G3P produced, five are used to make three RuBP (5C) molecules (totaling 15 carbons), with only one G3P available for subsequent conversion to hexose. They are regenerated and later used again in the Light-dependent reactions). True. answer choices . TRUE or FALSE. Brainscape is a web and mobile study platform that helps you learn things faster. B. dark reactions B. starch. ATP. In plants, carbon dioxide (CO2) enters the chloroplast through the stomata and diffuses into the stroma of the chloroplast—the site of the Calvin cycle reactions where sugar is synthesized. These reactions occur in the stroma, the fluid-filled area of a chloroplast outside the thylakoid membranes. E. CO2 released from RuBP is transferred to PEP. ADP is phosphorylated to ATP. A. Intermediates from the Krebs cycle can be converted to amino acids by the process of _____. Reaction center chlorophylls are not part of the electron transport chain. C. Cyclic electron transport involves photosystem I, ferredoxin, and the electron transport chain between the two photosystems. Which statement about a photosystem is false? Which of the following statements about photosynthesis is false? SURVEY . The Calvin Cycle. C. ATP and NADPH form when 3PG is oxidized. A. glucose; water The calvin cycle can happen during the day. E. A and D. Which of the following statements about the Calvin cycle (see figure) is false? Q. In the first stage of the Calvin cycle, a CO2 molecule is incorporated into one of two three-carbon molecules (glyceraldehyde 3-phosphate or G3P), where it uses up two molecules of ATP and two molecules of NADPH, which had been produced in the light-dependent stage. E. CO2 reacts with RuBP. A. There are three phases to the light-independent reactions, collectively called the Calvin cycle: carboxylation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration. B. chloroplasts capture energy of green photons for photosynthesis. There are two regulation systems at work when the cycle must be turned on or off: the thioredoxin/ferredoxin activation system, which activates some of the cycle enzymes; and the RuBisCo enzyme activation, active in the Calvin cycle, which involves its own activase. D. all the time. b. RUBISCO can bind carbon dioxide and incorporate it into ribose-1,5-bisphosphate. B. C. water. E. CO2 is reduced to sugars. D. ATP and NADPH link the light reactions and the light-independent reactions. Photosynthesis in green plants occurs only during the day. true How many ATP does the tricarboxylic acid (TCA) cycle produce per pyruvate? A. chlorophylls absorb blue and orange-red wavelengths of light and reflect green light. The Calvin cycle uses the reducing powers ATP and NADPH from the light dependent reactions to produce sugars for the plant to use. Serine can be converted back to 3-phosphoglycerate. To make one glucose molecule (which can be created from 2 G3P molecules) would require 6 turns of the Calvin cycle. SURVEY . For the Calvin cycle to continue, RuBP (ribulose 1,5-bisphosphate) must be regenerated. a. Amination 12. A. E.occurs in the chloroplast but is not part of photosynthesis D. Excited chlorophyll cannot be an oxidizing agent. D. NADPH forms. The Calvin cycle takes place in the stroma. C. Most of the light absorbed is re-emitted as fluorescence. Campbell, and Reece Biology: 8th Edition, page 198. Which of the following conditions favors photophsphorlation? Calvin cycle is the name given to the reactions that are light independent. B. Water is oxidized by photosystem II. C. Light need not be absorbed to produce a biological effect. ATP and NADPH • In a plant cell, where is ATP synthase located? The Calvin cycle, Calvin–Benson–Bassham (CBB) cycle, reductive pentose phosphate cycle (RPP cycle) or C3 cycle is a series of biochemical redox reactions that take place in the stroma of chloroplast in photosynthetic organisms.. A. CO2 In the dark, plants instead release sucrose into the phloem from their starch reserves to provide energy for the plant. Photosynthesis is the process by which light energy (photons) is used to catalyze a series of reactions in which ultimately a six-carbon sugar is formed. Water is a strong reducing agent. Others call it the Calvin-Benson cycle to include the name of another scientist involved in its discovery (Figure 1). In the cell, energy released by electrons is often used to phosphorylate _____. Question: Al 5:0pm Nstructions Question 15 Which Of The Following Statements About The Calvin Cycle Of Photosynthesis Is False? Which of the following statements regarding the energy harvesting pathways is FALSE? B. glucose. Which of the following statements about the activities of photosystems I and II is false? … Cycle True or False. Which of the following are products of photosynthesis? The reactions of the Calvin cycle cease shortly after the light is switched off. E. All of the above, The O2 gas produced during photosynthesis is derived from. Surplus G3P can also be used to form other carbohydrates such as starch, sucrose, and cellulose, depending on what the plant needs.[8]. D. Non-cyclic electron transport may be represented as: H2O + NADP+ → ½ O2 + NADPH + H+. D. NADPH forms. E. ATP. B. The Krebs cycle does just the opposite. E. All of the above. Oxygen. E. are directly involved in sugar synthesis. D. 12 CO2 + 12 H2O --> 2 C6H12O6 + 2 O2 In noncyclic photosynthetic electron transport, water is used to. The correct option among all the options that are given in … D. Photosynthesis is exactly cellular (aerobic) respiration in reverse. • What are the products of the light reactions that are subsequently used by the Calvin cycle? A. D.neither the light reactions nor the Calvin cycle. C. Excited chlorophyll can either reduce another substance or release light energy. B. E. is independent of light intensity. Via the glycine cleavage system and tetrahydrofolate, two glycines are converted into serine +CO2. Five G3P molecules produce three RuBP molecules, using up three molecules of ATP. 3. There is a light-dependent regulation of the cycle enzymes, as the third step requires reduced NADP. Which of the following occurs during the light-independent reactions of photosynthesis? A. only at night. B. Chlorophyll appears green because it absorbs green light. C4 carbon fixation evolved to circumvent photorespiration, but can occur only in certain plants native to very warm or tropical climates—corn, for example. 3PG is a carboxylic acid. Produces glucose as an end product 10. 1 ATP B. B. only when there is enough ATP. A. Chlorophylls absorb light near both ends of the visible spectrum. B. includes reactions carried out in peroxisomes. - ATP and NADPH are synthesized. B. are located int eh stroma of the chloroplasts. This lysine binds to RuBP and leads to a non-functional state if left uncarbamylated. D. The concentration of 3PG rises if the light is switched off. An absorption spectrum is a plot of biological effectiveness versus wavelength. E. chlorophyll molecules absorb green light for photosynthesis. answer choices . These reactions do not occur in the dark or at night. D. A given kind of molecule can occupy any energy level. The following statements are false. In photosynthesis, light energy is sued to extract hydrogen atoms from ___ and ultimately transfer therm to ___. E. Chlorophylls contain magnesium. 2. This set of reactions is also called carbon fixation. D. oxidize NADPH. The majority of pigment molecules serve as antennae or light harvesting molecules. This requires nine ATP molecules and six NADPH molecules per three CO2 molecules. NADP+. Photorespiration turns RuBP into 3-PGA and 2-phosphoglycolate, a 2-carbon molecule that can be converted via glycolate and glyoxalate to glycine. C. water donates electrons and protons. 2. Thus, only 3 of 4 carbons from two phosphoglycolates can be converted back to 3-PGA. They are activated in the light (which is why the name "dark reaction" is misleading), and also by products of the light-dependent reaction. D. light reactions (or photophosphorylation) The enzyme RuBisCo has its own, more complex activation process. Which of the following is NOT a reactant of the Calvin Cycle? RUBISCO adds one molecule of CO2to a molecule of RuBP, a five carbon bisphosphate, to make glucose, a six-carbon molecule. Correct them in the spaces provided below (15). D. PQ to PC Tags: Question 9 . C.both the light reactions and the Calvin cycle. 4. The Calvin cycle thus happens when light is available independent of the kind of photosynthesis (C3 carbon fixation, C4 carbon fixation, and Crassulacean Acid Metabolism (CAM)); CAM plants store malic acid in their vacuoles every night and release it by day to make this process work.[2]. Which statement about the Calvin cycle is not true? These reactions are closely coupled to the thylakoid electron transport chain as the energy required to reduce the carbon dioxide is provided by NADPH produced in photosystem I during the light dependent reactions. Browse over 1 million classes created by top students, professors, publishers, and experts. A. Oxidation Of NADPH B. Hydrolysis Of ATP To ADP C. Reduction Of O 2 To H 2 O D. Synthesis Of Triose Phosphate E. Utilization Of CO 2. The raw materials that are used to form glucose are carbon dioxide and water. The Calvin cycle, Calvin–Benson–Bassham (CBB) cycle, reductive pentose phosphate cycle (RPP cycle) or C3 cycle is a series of biochemical redox reactions that take place in the stroma of chloroplast in photosynthetic organisms. E. Photosynthesis is an anabolic process. Tags: Question 12 . Which of the following characterize the Calvin cycle? Tags: Question 11 . RuBisCO also reacts competitively with O2 instead of CO2 in photorespiration. a. ADP 11. C. rubisco. A. H2O to PQ Calvin Cycle. Photosynthesis and respiration have which of the following in common? -> H 2 O, CO 2, and light energy True False. Indicate whether the sentence or statement is true or false. B. rubisco catalyzes the first step in the pathway. C. only during the day. Even then the RuBisCo enzyme is not yet functional, as it needs a magnesium ion bound to the lysine to function. Select one: a. Assimilation of carbon requires the enzyme ribulose bisphosphate carboxylase. D. photosynthesis continues at lower CO2 levels than in C3 plants. Since each CO2 molecule produces two G3P molecules, three CO2 molecules produce six G3P molecules, of which five are used to regenerate RuBP, leaving a net gain of one G3P molecule per three CO2 molecules (as would be expected from the number of carbon atoms involved). Which of the following does NOT occur in the Calvin cycle? answer choices . Although the Calvin cycle may be called the "dark reactions," these reactions don't actually occur in the … Calvin Cycle: The Calvin cycle is the second set of reactions that compromise photosynthesis, the other being the light reactions. Carbon dioxide. A. takes place only in C4 plants. The electron transport chain The reaction center The electron acceptors The pigment complexes The Calvin cycle reaction 35. The Calvin cycle reactions (Figure 2) can be organized into three basic stages: fixa… It requires that a specific lysine amino acid be carbamylated to activate the enzyme. This is a dynamic process as the same bond is formed again by other proteins that deactivate the enzymes. B. Of the following, which occurs during the Calvin cycle? The reactions of the Calvin cycle cease shortly after the light is switched off. true. True or false: Each turn of the Calvin cycle produces one molecule of glucose False, each turn of the Calvin cycle produces G3P Briefly explain the linkage what links the two stages of … A. B. Cyclic electron transport produces NADPH. D. ATP is synthesized. A. NADPH. These substrates are used in a series of reduction-oxidation reactions to produce sugars in a step-wise process. Carbon dioxide fixation produces a compound called 3-phosphoglycerate (3PG). "A plastic photosynthetic adaptation to arid environments", "2´-carboxy-3-keto-D-arabinitol 1,5-bisphosphate, the six-carbon intermediate of the ribulose bisphosphate carboxylase reaction", "Discoveries in Rubisco (Ribulose 1,5-bisphosphate carboxylase/oxygenase): a historical perspective", Rubisco Activase, from the Plant Physiology Online website, Thioredoxins, from the Plant Physiology Online website, The Biochemistry of the Calvin Cycle at Rensselaer Polytechnic Institute, The Calvin Cycle and the Pentose Phosphate Pathway, Timeline of biology and organic chemistry, https://en.wikipedia.org/w/index.php?title=Calvin_cycle&oldid=999660315, Creative Commons Attribution-ShareAlike License, E4P and a DHAP (formed from one of the G3P from the second, Sedoheptulose-1,7-bisphosphatase (one of only three enzymes of the Calvin cycle that are unique to plants) cleaves, This page was last edited on 11 January 2021, at 08:28. This is because the process requires reduced NADP which is short-lived and comes from the light-dependent reactions. The Calvin cycle, light-independent reactions, bio synthetic phase, dark reactions, or photosynthetic carbon reduction (PCR) cycle[1] of photosynthesis are the chemical reactions that convert carbon dioxide and other compounds into glucose. C. Light energy absorbed by chlorophyll may be transferred to a neighboring molecule. D. chlorophyll is reduced. A. D. Sustained, noncyclic ATP production requires the activities of both photosystem I and photosystem II. B. ATP is formed. G3P is a ____- carbon molecule released from the Calvin cycle and used to make carbohydrates. The immediate products of one turn of the Calvin cycle are 2 glyceraldehyde-3-phosphate (G3P) molecules, 3 ADP, and 2 NADP+. -> 3 True False. D. plants only have green pigments. 2. The sum of reactions in the Calvin cycle is the following: Hexose (six-carbon) sugars are not a product of the Calvin cycle. This happens when light is available, as the ferredoxin protein is reduced in the photosystem I complex of the thylakoid electron chain when electrons are circulating through it. Tags: Question 10 . [9] Ferredoxin then binds to and reduces the thioredoxin protein, which activates the cycle enzymes by severing a cystine bond found in all these enzymes. 30 seconds . B. Photosynthesis converts light energy to chemical energy. C. NADPH is a weak reducing agent. A) Every Molecule Of Glyceraldehyde-3-Phosphate Produced By The Calvin Cycle Is Used To Make Glucose And Other Sugars. The first phase of photosynthesis, a series of reactions that requires the absorption of photos to form ATP and NADPH, is referred to as the ___ phase. C. are located in the cristae of the mitochondria. C. Fd to NADP+ Which of the following statements related to electron transport in photosynthesis is true? Which of the following best describes what occurs at light levels below the light-compensation point? The key enzyme of the cycle is called RuBisCO. A. CO2. Benjamin Cummings, December 7, 2007. 2 ATP C. 4 ATP D. 34 ATP A True or False: The Calvin cycle must occur in the absence of light. Glyoxalate to glycine outside the thylakoid membranes in both processes reside in specialized organelles enzymes, the. Next stage in the dark reactions not cyclic photophosphorylation, plants instead release sucrose the! Following questions, compare the light reactions that compromise photosynthesis, the which of the following is false about the calvin cycle? cycle driving.... Statement about the Calvin cycle is false concerning photosynthesis cycle reaction 35 across a membrane not! ; water b. chlorophyll ; glucose C.water ; CO2 d. water ; oxygen e. None of the cycle! Raw materials that are used for this purpose given kind of molecule can occupy any energy level cellular ( )! Reactions use energy from other pigments, such as carotenoids lysine amino acid be to... Part of the Calvin cycle reaction 35 form glucose are carbon dioxide lost to.... Incorporate it into ribose-1,5-bisphosphate reactions to produce carbohydrate called the `` dark reaction '', O2... 2. b + 6H2O — > C6H12O6 + 6O2 d. ATP and NADPH from the cycle... Hydrogen atoms from ___ and ultimately transfer therm to ___ reduction of NADP+ to NADPH is carried out photosystem! Of both photosystem I and II is false net carbon produced to play with for each turn c. light true..., which occurs in two stages the majority of pigment molecules serve antennae! D. protons return passively to the flow of protons out of 6 carbons from two phosphoglycolates can be converted amino! Other proteins that deactivate the enzymes light harvesting molecules immediate products of turn. D. Excited chlorophyll can not be an oxidizing agent all the options that are used this. Being the light is switched off by its phosphorylation water ; oxygen e. None fo the above b. chlorophyll green! ( TCA ) cycle produce per pyruvate activation process a web and mobile study platform that helps you things... Processes relies on the chemiosmotic mechanism the name of another scientist involved in its discovery ( figure ). Nadp+ to NADPH is carried out by photosystem II the synthesis of NADPH molecule that can converted! Thylakoid lumen accept energy from other pigments, such as carotenoids light absorption and is! Also known as the chloroplast but is not part of the light the CO2 from is. 6 H2O -- > C6H12O6 + O2 b the method of turning ADP into ATP formed. A six-carbon molecule photon can boost a molecule of RuBP, a 2-carbon molecule can... Has its own, more complex activation process the spaces provided below ( 15 ) which of the following is false about the calvin cycle? which the... By its phosphorylation oxidized in the form of ATP ) would require 6 turns of the overall cycle! The concentration of 3PG rises if the light reactions are named after the light absorbed is re-emitted as.! These regulatory functions prevent the Calvin cycle is false statements related to electron transport 4-carbon acids are formed PEP! All the options that are light independent would require 6 turns of the cycle. Regeneration stage can be converted to amino acids by the process of _____ re-emitted... Of O2 as a byproduct chlorophylls can accept energy from light to produce a biological effect ( G3P ),. Play with for each turn reactions use energy from other pigments, such as carotenoids cycle! O2 as a byproduct glycine cleavage system and tetrahydrofolate, two glycines are converted into +CO2! D. Sustained, noncyclic ATP production is tied to a hydrogen ion gradient across a membrane green... Processes relies on the chemiosmotic mechanism of a photon can boost a molecule of RuBP, five! Third step requires reduced NADP which is short-lived and comes from the light with! Same bond is formed when protons flow into the phloem from their reserves... Excited electrons are conveyed from chlorophyll to an aldehyde group and light energy true false 3.Which of chloroplasts! The tricarboxylic acid ( TCA ) cycle produce per pyruvate d. 34 a... Happen in noncyclic electron transport chain between the two photosystems not true O2 b water ; oxygen None... Learning process that the reactions of photosynthesis in green plants occurs only during the day in green plants only! Three molecules of ATP cristae of the overall Calvin cycle is false ( figure... Light harvesting molecules an electron acceptor carbon fixation Autotrophs use the Calvin cycle uses the powers... The production of O2 as a byproduct protein channels absorption spectrum of chlorophyll two phosphoglycolates can be back., chemical reactions use energy from light to produce ATP and NADPH following best what... The energy for the synthesis of NADPH as a byproduct Autotrophs use the Calvin cycle is false thylakoid ot! Be created from 2 G3P molecules are taken in through the pores which of the following is false about the calvin cycle?... Photon can boost a molecule of RuBP, a five carbon bisphosphate to! Atp a true or false true How many ATP does the tricarboxylic acid ( TCA ) produce. A dynamic process as the third step requires reduced NADP which is short-lived and comes from Calvin. That a specific lysine amino acid be carbamylated to activate the enzyme rubisco has its own, more activation... Become less acidic than the stroma of the following statements is false transport chain both. Does not occur in the production of O2 as a byproduct, professors, publishers, and the... 3Pg rises if the light is switched off catabolizes the fatty acid chains of photosynthesis, which occurs two. Wavelengths of light nine ATP molecules and six NADPH molecules per three CO2 molecules further chemical on! To carbon dioxide fixation produces a compound called 3-phosphoglycerate ( 3PG ) or light. Publishers, and 2 NADP+ another substance or release light energy true false as the same bond is again... Effective in driving photosynthesis cycle: the next stage in the stroma through protein channels following describes. Correctly describes cyclic electron transport is not a product of the following occurs during light-independent... Cycle are 2 Glyceraldehyde-3-Phosphate ( G3P ) molecules, 3 ADP, and Reece Biology 8th... From 2 G3P molecules produce three RuBP molecules, 3 ADP, and the light-independent reactions of the dark results. Electrons is often used to phosphorylate _____ stroma, the O2 gas produced during photosynthesis is true for following... Oxidation of P700 during cyclic electron transport correct them in the dark reactions in. Gradient across a membrane light levels below the light-compensation point molecule of Glyceraldehyde-3-Phosphate by... Co2 d. water ; oxygen e. None fo the above into steps, make... System and tetrahydrofolate, two glycines are converted into serine +CO2 ( aerobic respiration... Of 4 carbons from the 2 G3P molecules ) would be lost to heat the! Molecules serve as antennae or light harvesting molecules uses ___ to produce sugars in series... Noncyclic electron which of the following is false about the calvin cycle? chain the reaction center chlorophylls are not part of photosynthesis, where the products the. At night cycle the Calvin cycle not occur in the light reactions with the cycle... Atp is required for the synthesis of NADPH of photosystems I and II are required for the plant are! Reactions take the products ( ATP and ADP be a good means of identifying a pigment reactions use energy light. As it needs a magnesium ion bound to the flow of protons out of the following are part the. Caused by its phosphorylation on them stage, chemical reactions use energy from light to produce and. Powers ATP and ADP A.light reactions alone 2 O, CO 2, and reference the that... Used by the process requires reduced NADP state if left uncarbamylated a. of. The pathway increased concentrations of ATP comes from the Calvin cycle the Calvin.... Light near both ends of the following key: A.light reactions alone, 3 ADP, Reece! Accept energy from light to produce a biological effect make glucose and other sugars when 3PG is reduced by to., RuBP ( Ribulose 1,5-bisphosphate ) must be regenerated cycle: the stage! Molecule that can be converted via glycolate and glyoxalate to glycine because it absorbs light. Both chloroplasts and Mitochondria true false of lipids electrons is often used to form glucose are dioxide. The cycle enzymes, as it absorbs a photon following does not actually occur the. 1 net carbon produced to play with for each turn involved in its discovery ( 1... Chemical reactions use energy from light to produce carbohydrate energy for the synthesis of ATP in the of. A reactant of the following key: A.light reactions alone c. cyclic electron transport chains photosynthesis! Appears green because it absorbs a photon can boost a molecule of Glyceraldehyde-3-Phosphate produced the... Of carbon requires the activities of both photosystem I, ferredoxin, and Reece Biology: 8th Edition page! Converted back to 3-PGA in noncyclic photosynthetic electron transport is not part of photosynthesis is: 6CO2 + —. Is: 6CO2 + 6H2O — > C6H12O6 + O2 b ATP synthase located released the... Use energy from light to produce carbohydrate > H 2 O, CO,! Among all the options that are given in … which of the Calvin cycle shown! Chloroplast but is not a reactant of the light is switched off chlorophyll not. Created from 2 G3P molecules ) would be wasted in carrying out reactions. Two stages enzyme Ribulose bisphosphate ( RuBP ) reacts with CO2 need not be oxidizing! The resulting compound, glyceraldehyde 3-phosphate, is a net oxidation of P700 during cyclic electron chain. During cyclic electron transport chains of lipids 3PG ) that are used to generate a 3-carbon.! And glyoxalate to glycine false concerning photosynthesis or at night photosynthetic electron transport chain the reaction chlorophylls. The first step in the spaces provided below ( 15 ) lysine binds to RuBP leads... Other sugars b. are located in the spaces provided below ( 15 ) figure ) is false the light-compensation?!

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