If Photosystem I is inhibited, will H+ still be pumped into the thylakoid space?No, because the electron flow would be stalledYes, because ATP synthase would still pump H+Yes, because Photosystem II is after the Electron Transport ChainO No, because Photosystem I is before the Electron Transport ChainYou are working at a biotech company that is studying new enzymes from plant cells to producebiofuels. You know that one of the substrates of the enzyme is the hydrocarbon tails of fatty acids.Which amino acid might you expect to find in the active site of the enzyme?O glutamic acidO tryptophanserinehistidineIf you modified the tail of chlorophyll to be polar, which of the following would you expect tohappen to light energy?Light would not be absorbed by chlorophyllLight would be absorbed but the energy would be lost as fluorescence/heat since the chlorophyll would notinteract with the membrane reaction centerO Light would be absorbed and the electron would remain in an excited state since the chlorophyll would notinteract with the membrane reaction centerO Photosynthesis could still occur because the porphyrin ring is what captures light

When an electron leaves PSII, it is transferred first to a small organic molecule (plastoquinone,…

If Photosystem I is inhibited, will H+ still be pumped into the thylakoid space? O No, because the electron flow would be stalled O Yes, because ATP synthase would still pump H+ O Yes, because Photosystem Il is after the Electron Transport Chain O No, because Photosystem I is before the Electron Transport Chain You are working at a biotech company that is studying new enzymes from plant cells to produce biofuels. You know that one of the substrates of the enzyme is the hydrocarbon tails of fatty acids. Which amino acid might you expect to find in the active site of the enzyme? glutamic acid O tryptophan serine O histidine If you modified the tail of chlorophyll to be polar, which of the following would you expect to happen to light energy? O Light would not be absorbed by chlorophyll O Light would be absorbed but the energy would be lost as fluorescence/heat since the chlorophyll would not interact with the membrane reaction center O Light would be absorbed and the electron would remain in an excited state since the chlorophyll would not interact with the membrane reaction center O Photosynthesis could still occur because the porphyrin ring is what captures light

If Photosystem I is inhibited, will H+ still be pumped into the thylakoid space? O No, because the electron flow would be stalled O Yes, because ATP synthase would still pump H+ O Yes, because Photosystem Il is after the Electron Transport Chain O No, because Photosystem I is before the Electron Transport Chain You are working at a biotech company that is studying new enzymes from plant cells to produce biofuels. You know that one of the substrates of the enzyme is the hydrocarbon tails of fatty acids. Which amino acid might you expect to find in the active site of the enzyme? glutamic acid O tryptophan serine O histidine If you modified the tail of chlorophyll to be polar, which of the following would you expect to happen to light energy? O Light would not be absorbed by chlorophyll O Light would be absorbed but the energy would be lost as fluorescence/heat since the chlorophyll would not interact with the membrane reaction center O Light would be absorbed and the electron would remain in an excited state since the chlorophyll would not interact with the membrane reaction center O Photosynthesis could still occur because the porphyrin ring is what captures light

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter8: Photosynthesis

Section: Chapter Questions

Problem 4ITD

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Match each term with its most suitable description. ____ PGAL formation a. absorbs light ____CO2 fixation b. converts light to chemical energy ____ autotroph c. self-feeder ____ ATP forms NADPH does not d. electrons cycle back to photosystem ____ photorespiration e. problem in C3 plants ____ photosynthesis f. Calvin-Benson cycle product ____ pigment g. water molecules split ____ photolysis in photosynthesis h. rubisco function
The Overall Free Energy Change for Photosynthetic NADP+ Reduction What is the overall free energy change (G) for noncyclic photosynthetic electron transport? 4 (700-nm photons) + 4 (680-nm photons) + 2 H2O + 2 NADP+O2 + 2 NADPH + 2H+
Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of photosynthesis by exposing the green alga Chlorella to CO2 labeled with the radioisotope carbon 14. By looking at which compounds the C14 ended up in, they were able to identify all intermediates in this cyclic pathway. Why did they predict correctly that the same set of intermediates would be formed in the light reaction in land plants?
Plants containing only chlorophyll b are exposed to radiation with the following wavelengths: 10nm (x- rays), 450nm (blue light), 670nm (red light), and 800nm (infrared light). Which plants harness the most energy for photosynthesis? X-ray irradiated plants Blue light irradiated plants Red light irradiated plants Infrared irradiated plants
In ________, electrons that have been energized by light contribute their energy to add phosphate to ADP, producing ATP. (a) crassulacean acid metabolism (b) the Calvin cycle (c) photorespiration (d) C4 pathways (e) photophosphorylation
Photosynthesis directly opposes respiration in determining how plants influence atmospheric CO2 concentrations. When a leaf is in the light, both photosynthesis and respiration are occurring simultaneously. The data in the Table were collected from the leaf of a sagebrush plant that was enclosed in a chamber that measures the rate of CO2 exchange. The same leaf was used to collect the data in Interpret the Data in Chapter 7. Respiration is shown as a negative and photosynthesis as a positive rate of CO2 exchange. The net photosynthesis rate is the amount of CO2 (in micromoles per square meter per second) assimilated by the leaf while respiration is occurring; a positive value indicates more photosynthesis is occurring than respiration. The light exposed to the leaf is quantified as the number of photons in the 400 to 700 nm wavelength, the photosynthetic photon flux density (PPFD); 2,000 mol/m2/s is equivalent to the amount of light occurring at midday in full Sun. Observation Photosynthetic Photon Flux Density (PPFD) (mol/m2/s) Net Photosynthesis (mol/m2/s) 1 2,000 9.1 2 1,500 8.4 3 1,250 8.2 4 1,000 7.4 5 750 6.3 6 500 4.8 7 250 2.2 8 0 -2.0 Why is net photosynthesis negative when PPFD is zero? Looking at the respiration data from Interpret the Data in Chapter 7, at what temperature do you think these data were collected? Source: Data based on unpublished research by Brent Ewers, University of Wyoming.
Which of the following substances does not participate in the Calvin-Benson cycle? a. ATP c. NADPH e. PGAL b. O2 d. RuBP f. CO2
Which of the following is a correct step in the light-dependent reactions of the Z system? a. Light is absorbed at P700, and electrons flow through a pathway to NADP+, the final acceptor of the linear pathway. b. Electrons flow from photosystem II to water. c. NADP+ is oxidized to NADPH as it accepts electrons. d. Water is degraded to activate P680. e. Electrons pass through a thylakoid membrane to create energy to pump H+ through the cytochrome complex.
Where in plant cells does the Calvin cycle take place? a. thylakoid membrane b. thylakoid space c. stroma d. granum
Figure 5.7 On a hot, dry day, plants close their stomata to conserve Water. What impact will this have on photosynthesis?
IS THIS A GOOD BREAK DOWN? WHAT ELSE CAN I SHOULD I ADD? Briefly explain the light-dependent reactions of photosynthesis: where does this take place, what are the reactants and what is produced? Light-dependent reactions are used to convert light energy into chemical energy for use by the plants. Through the process of photosynthesis, the energy collected from the sun is broken down, along with water molecules, to produce NADPH and ATP. Light-dependent reactions Goal Convert light energy into chemical energy Location Chloroplasts—thylakoids Input Sunlight, H2O, NADP+, ADP Output NADPH, ATP, O2
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