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Photosynthesis: Understanding the Process and Relevance

Learn about the different stages of photosynthesis, the role of pigments, and how ATP and NADPH are utilized. Explore photorespiration, C3 and C4 photosynthesis, and the benefits of CAM photosynthesis. Study questions included.

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Photosynthesis: Understanding the Process and Relevance

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  1. Photosynthesis - Chapter 8 Topics you are responsible for This chapter goes into much more detail than for what you will be responsible. Thus, the outline of these powerpoint slides and the question bank will be guides to what you should understand. You won’t be responsible for the details of bacterial photosynthesis, energy processing in reaction centers, the enhancement effect, or the specific steps of the electron transport. However, be sure to read about the properties of light and the absorption properties of different pigments. End of Chapter questions: Understand: all Apply: all Synthesize: all Do all mQuiz questions Cellular Respiration

  2. Where does photosynthesis occur? Chloroplast structure Inner and outer membranes Thylakoids -- granna Cellular Respiration

  3. What are the characteristics of the photosynthetic pigments? Chlorophyll and carotenoids Light harvesting complexes -- light absorbing pigments -- Reactions Centers e- Resonation Cellular Respiration

  4. What are the two stages of Photosynthesis? Light dependent reactions vs Light independent reactions = “Calvin- Bensen cycle” Cellular Respiration

  5. The L-D reactions 2 “Photosystems” PSII & PSI Electron transport plastoquinone cytochrome b6-f plastocyanin ATP synthesis via Photo-phosphorylation Cellular Respiration

  6. What do different depictions of the L-D reactions show? Z-scheme Membrane arrangement Virtual Cell Photosynthesis Cellular Respiration

  7. How are ATP and NADPH used to convert (fix) CO2 into organic molecules? Calvin-Bensen Cycle -- 3 stages CO2 Fixation Carbon Reduction RUBP Regeneration RUBP carboxylase/ Oxygenase -- “Rubisco” “C3” photosynthesis Calvin cycle Cellular Respiration

  8. What is photorespiration? “RUBP carboxylase/oxygenase” Why does it reduce PS carbohydrate yield? Under which conditions is it most problematic? Cellular Respiration

  9. ‘C4’ photosynthesis How does it differ from C3? How does it address photorespiration? In which plants? Cellular Respiration

  10. Why do some plants carry out ‘CAM’ photosynthesis? “Crassulacean Acid Metabolism” Which plants? Why is this beneficial? -- Water conservation Cellular Respiration

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