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- How is the energy from the sun transported within chloroplasts and ultimately used to createNADPH and ATP? What would happen if you forgot to water your plant for several days? Whatif a plant were only exposed to read light – would photosynthesis be possible? Support youranswer with details of the processes involved.Which color light waves best at carrying out photosynthesis?Why are C4 and CAM photosynthesis more energetically expensivethan C3 photosynthesis? What climate conditions would favor C4and CAM plants?
- Excited molecules can return to the ground state by severalmeans. Describe each briefly. Which of these processes areimportant in photosynthesis? Describe how they function ina living organism.One of the most significant sources of thepollutants that contribute to photochemicalsmog is exhaust from automobiles. Hydrogencell cars run on hydrogen and electricityand emit only water. Do you think thatthe government should provide strongincentives, such as tax breaks, for peoplewho pay extra for these cars?Of all the photosynthetic pigments, which absorbs the most sunlight and at which wavelengths(s) of visible light?
- In chloroplasts, protons are pumped out of thestroma across the thylakoid membrane, whereas in mito-chondria, they are pumped out of the matrix across thecrista membrane. Explain how this arrangement allowschloroplasts to generate a larger proton gradient acrossthe thylakoid membrane than mitochondria can generateacross the inner membrane.n cyclic photophosphorylation in photosystem I, ATP is produced, even though water is not split. Explain how the process takes placeMelvin 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?
- Which of the mechanisms for dissipating light energy shown in Fig. would best protect the photosystems from excess light energy?The light-independent or dark reactions of photosynthesis occur only at night. Do you agree with this statement?Plants undergo both photosynthesis and cellular respiration. Why don’t plants simply use the ATP pro¬duced in the light reactions of photosynthesis to drive cellular processes?