Use the following information to answer questions 11-12. Thomas Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light. 11. What did he conclude about the congregation of bacteria in the red and blue areas? a. Bacteria released excess CO2 in these areas. b. Bacteria congregated in these areas due to an increase in the temperature of the red and blue light. c. Bacteria congregated in these areas because these areas had the most O2 being released. d. Bacteria are attracted to red and blue light and thus these wavelengths are more reactive than other wavelengths. 12. The purpose of this experiment was to determine a. the relationship between heterotrophic and autotrophic organisms. b. the relationship between wavelengths of light and the rate of aerobic respiration. c. the relationship between wavelengths of light and the amount of heat released. d. the relationship between wavelengths of light and the rate of photosynthesis. 13. In plant cells, ATP is made in response to light. An electron transport chain is involved. This electron transport chain is found in the a. thylakoid membranes of chloroplasts. b. stroma of chloroplasts. c. inner membrane of mitochondria. d. matrix of mitochondria. 14. All of the following statements are correct regarding the light-independent (dark) reactions of photosynthesis except a. The energy source utilized is the ATP and NADPH obtained through the light reaction. b. This reaction begins soon after sundown and ends before sunrise. c. The 5-carbon sugar RuBP is constantly being regenerated. d. The pathway used is the Calvin cycle. 15. The color of light least effective in driving photosynthesis is a. blue. c. orange. b. red. d. green.
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Which wavelength of light is least useful to driving photosynthesis? What result of Theodor Engelmann's famous experiment indicated to him which wavelength(s) were the best drivers of photosynthesis? The scientist removes the pair of chlorophyll molecules from the reaction center complex. Which of the following consequences would be most likely to occur? The primary electron acceptor would capture boosted electrons from the light-harvesting complex. The transfer of energy from the light-harvesting complex to the reaction center complex would stop. Light would be absorbed twice as fast to make up for the loss of the chlorophyll pigments. None of the above consequences would occur. Fill in the following table regarding the photosystems of the light reactions: Photosystem I Photosystem II Product Splits H2O? Uses an electron transport chain? Contains an electron acceptor? Chapter Content: The Calvin Cycle: Making Sugar from Carbon Dioxide Complete the following questions as you read the seventh chapter content The Calvin Cycle: Making Sugar from Carbon Dioxide: The Calvin cycle uses ATP from the light reactions to make sugar.
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Seeds were germinated in the dark on three plates. Plate A was irradiated with a short pulse of red light; plate B was irradiated with a short pulse of red light followed immediately by a pulse of far-red light; plate D was irradiated by a short pulse of red light followed one hour later by a pulse of far-red light; and plate C was the control and was maintained in the dark. After three days, the plates were scored for percentage of germination, as shown in this table. What hypothesis do the results suggest about the mechanism of action of red light? a. Red light converts the phytochrome to its active form Pr which can be converted to the inactive form Pfr by far red light. After one hour, cascade of events initiated by Pfr has already begun promoting germination and hence, it cannot be reversed even by the pulse of far light. b. Red light converts the phytochrome to its active form Pfr, which can be converted to the inactive form Pr by far-red light. After one hour, cascade of events initiated by Pr has already begun promoting germination and, hence, it cannot be reversed even by the pulse of far light. c. Far red light converts the phytochrome to its active form Pfr, which can be converted to the inactive form Pr by red light. After one hour, the cascade of events initiated by Pr has already begun promoting germination and, hence, it cannot be reversed even by the pulse of far light. d. Red light converts the phytochrome to its active form Pfr which can be converted to the inactive form Pr by far red light. After one hour, the cascade of events initiated by Pfr has already begun promoting germination and, hence, itcannot be reversed even by the pulse of far light.
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