front 1 During photosynthesis, the energy given up by electrons as they move through the electron transport chain is used to | back 1 generate an electrochemical H+ gradient across a membrane. |
front 2 Which portion of the photosynthetic apparatus is involved in the oxidation or splitting of water? | back 2 manganese cluster |
front 3 Which of the following represents a reactant or input for the light reaction of photosynthesis? | back 3 H2O |
front 4 What is the main role of the pigment molecules within the antenna or light-harvesting complex? | back 4 Absorb photons and transfer light energy to the reaction center chlorophyll |
front 5 Which of the following statements regarding photosystem II is FALSE? | back 5 Photosystem II strips an electron from water for direct transfer to the electron transport chain. |
front 6 Which of the following contributes to the electrochemical gradient that exists across the thylakoid membrane during photosynthesis? | back 6 The electron transport chain.
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front 7 Which of the following best represents the path of electron flow that occurs during photosynthesis? | back 7 H2O-->P680-->Final Electron AcceptorElectron transport chain-->P700 |
front 8 What are the primary functions of both photosystems I and II? | back 8 produce ATP and NADPH |
front 9 Which portion of the photosynthetic apparatus absorbs light? | back 9 both photosystem I and photosystem II |
front 10 How might a plant cope with the fact that the Calvin cycle uses more ATP than NADPH, yet produces roughly the same amount of both energy intermediates in photosystems I and II? | back 10 Photosynthesis can revert from a noncyclic to cyclic electron flow. |
front 11 Which order of events for the Calvin cycle is correct? | back 11 III. Carbon fixation
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front 12 Where does the Calvin cycle occur? | back 12 chloroplast stroma |
front 13 This molecule combines with CO2 to form the 3-carbon substance, 3-phosphoglycerate. | back 13 ribulose biphoshpate (RuBP) |
front 14 Which of the following requires both ATP and NADPH? | back 14 the Calvin cycle only |
front 15 Using 14CO2 as a radioactive tracer, which of the following molecules would be the last to incorporate 14C within the Calvin cycle? | back 15 ribulose biphosphate (RuBP) |
front 16 Which of the following is NOT a product of the Calvin cycle? | back 16 NADPH |
front 17 All of the following are required for the Calvin cycle EXCEPT | back 17 H2O. |
front 18 Which of the following statements about photorespiration is INCORRECT? | back 18 It utilizes the enzyme PEP carboxylase rather than Rubisco to produce 3-phosphoglycerate. |
front 19 Which of the following has the highest photosynthetic efficiency in hot and dry environments? | back 19 C4 plants |
front 20 Which is TRUE of succulent plants such as cacti or pineapple? | back 20 They produce 4-carbon malate in the first step of carbon fixation |
front 21 CAM (crassulacean acid metabolism) plants such as cacti differ from standard C4 plants such as corn in which of the following way? | back 21 CAM plants are limited to producing CO2 for the Calvin cycle during the day, while C4 plants produce CO2 for the Calvin cycle both during the day and at night. |
front 22 Which of the following is the primary advantage of C4 plants over C3 plants? | back 22 C4 plants minimize photorespiration compared with C3 plants.
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