21. What happens when a photosystem absorbs light? * A. Sugar phosphates are produced B. Electrons are transferred to ATP C. RUBP accepts electrons D. Electrons are ejected from its special pair 25. Which sequence correctly occurs in the Calvin cycle? * A. 3PG –1,3-biphosphoglycerate -G3P – RUBP B. RUBP + CO2 – PGA – 3PG -G3P – glucose -RUBP C. RUBP + Co2 – PGA – 3PG -1,3-biphosphoglycerate - RUBP D. RUBP + Co2 – PGA – 3PG –1,3-biphosphoglycerate -G3P – RUBP

21. What happens when a photosystem absorbs light? * A. Sugar phosphates are produced B. Electrons are transferred to ATP C. RUBP accepts electrons D. Electrons are ejected from its special pair 25. Which sequence correctly occurs in the Calvin cycle? * A. 3PG –1,3-biphosphoglycerate -G3P – RUBP B. RUBP + CO2 – PGA – 3PG -G3P – glucose -RUBP C. RUBP + Co2 – PGA – 3PG -1,3-biphosphoglycerate - RUBP D. RUBP + Co2 – PGA – 3PG –1,3-biphosphoglycerate -G3P – RUBP

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter20: The Protists

Section: Chapter Questions

Problem 4CT: Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of...

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choose letter pls 1. why is cyclic electron flow important in photosynthesis? a. generates greater amount of energy in simple but efficient pathway.b. allows the plants to conserve energy produced during photosynthesis.c. converts chemical energy from inorganic moleccules with less input of atp.d. allows the plants sensitive to light and living in low light environment to produce atp 2. which of the following does not occur during the light dependent reaction?a. photolysis of h2ob. realease of oxygenc. regeneration of co2 acceptord. phosphorylation of adp forming atp
Put the steps for the formation and usage of ATP in photosynthesis in order. 1. Hydrogen ions will diffuse out of the thylakoid; the concentration of H+ ions inside the thylakoid is higher than outside. 2. ATP synthase adds a phosphate group to ADP to form ATP. 3. Potential energy is stored, so hydrogen ions can now diffuse out through protein channels in the thylakoid membranes.
Which of the following statements about the light reactions of photosynthesis are correct? 1. Absorption of light does one thing: it makes chlorophyll easier to oxidize. 2. In PSII, the rate of damage to the D1 protein can never exceeds the rate of repair. 3. Electron transport is spontaneous (exergonic) as electrons move from P680* to P700+. 4. Compared to anoxygenic photosynthesis, in oxygenic photosynthesis less light needs to be absorbed to reduce NADP+. A. 1,2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1,2,3 and 4 are correct
Imagine that ferredoxin is no longer able to participate in cyclic electron flow but is otherwise unaffected. What is the logical result? Select all statements that are true below. O a. Water would be oxidized O b. The Calvin cycle would stop U c. NADPH would no longer be made O d. ATP would no longer be made U e. The light reactions would stop
A culture of the single celled organism Chlamydomonas is actively carrying out photosynthesis in the presence of light and CO2. If you turned off the light, how would you expect the amounts of ribulose 1,5-bisphosphate and 3-phosphoglycerate to change over the next minute? How about if you left the light on and removed the CO2?
d) In the presence of sunlight, an electrochemical gradient is generated between two of the spaces within the chloroplast. 1.Describe what happens when a photon of light energy hits a molecule of chlorophyl. 2. What is meant by the term electrochemical gradient? 3.What role does the photosynthetic electron transport chain play in the generation of the electrochemical gradient? 4. Two chemical reactions also contribute to the generation of the electrochemical gradient. What are the reactions, where do they occur, and why do these factors affect the gradient? 5. The electrochemical gradient can be utilised by ATP synthase to generate ATP - explain how the location and structure of ATP synthase enable it to perform this function. e) The light reactions of photosynthesis generate ATP and NADPH for use in the dark reactions (i.e., the Calvin cycle). Why are they needed?
The ultimate source of energy in our planet is sunlight. In the first stage of photosynthesis, light energy is captured in chlorophyll-containing reaction centers (PSII and PSI). What is the first step in the capture of light energy at PSII? a. The energy carriers ATP and NADPH + H+ are synthesized. b. CO2 reacts with the C5 sugar ribulose-1,5-bis-phosphate in the first step of the Calvin cycle. c. Starch is synthesized. d. H2O is photolyzed and its electrons are captured by special chlorophyll molecules. e. Sucrose is synthesized from glucose and fructose.
Which of the following descriptions about photosystems during linear electron flow is not correct? Select one: a. energy required for ATP synthesis is provided when electrons pass through the electron transport chain from photosystem I b. photosystem II works before photosystem I c. P680 is the chlorophyll a pair that exists in photosystemII d. the primary electron acceptor receives electrons from P680 or P700 e. P680+ receives electrons from the splitting of water
Part 2: Matching Match each compound to a step that of the Light-Dependent Reaction. f. electron acceptor g. electron carrier h. chlorophyll II. i. NADPH reductase j. b,- f complex a. P700 b. Р680 C. P680 d. ATP synthase e. Photosystem I | 51. Light photons excite electrons from this part of the Reaction Centre. 52. Also known as Photosystem II. 53. Reduced by electrons removed from H,O through photolysis. 54. Uses energy released by redox reaction to pump H' ions into the thylakoid space. 55. Photons excite electrons that leave and are then replaced by electrons used to pump H° ions into thylakoid space. 56. This complex has the Reaction Centre used for cyclic photophosphorylation. 57. Protein that is embedded in the thylakoid membrane. 58. The enzyme that helps remove electrons from the thylakoid. 59. The enzyme that acts to form ATP with chemiosmosis.
Identify the chemical basis for ApH and AY across the chloroplast thylakoid membrane by dragging the descriptions to their targets. Be sure to notice that the upper arrow iindicates ApH and the lower arrow indicates ΔΨ. ATP synthase complex H+ N ADP + P₁ Light energy ATP H*N Photosystem I/II- Chloroplast N side Aus PN ApH T + Thylakoid membrane HTp H+p Lumen Stroma P side Proton circuit A B High H concentration Low positive charge High positive charge Low H+ concentration Within the image, identify the types of proton translocation by dragging each label to its target. O XH₂ 2H+ + Z 2 H* ZH₂ O XH₂ Z 2H+ ZH₂ 2H+ C A B Proton pump Redox loop
Imagine that ferredoxin is no longer able to participate in cyclic electron flow but is otherwise unaffected. What is the logical result? Select all statements that are true below. O a. The light reactions would stop O b. Water would be oxidized U c. NADPH would no longer be made Od. ATP would no longer be made U e. The Calvin cycle would stop
1. Where do the protons used in the light reactions come from? 2. What is the significance of light reaction? 3. What are the products of light reactions that are used in the Calvin cycle? 4. What are the roles of ATP and NADPH in photosynthesis?