Bioenergetics and the Light-Dependent Reactions of Photosynthesis

Goals and Objectives:

Here, again, like chapter 7 most of this information is background material that should be review from Bgy 33:  Cell Biology.  I will not ask specific questions from this chapter except pages 181-183 which deals with the regulation of photosynthesis.

  1. Be able to explain how the light -harvesting complexes (LHC) function to regulate the input of energy into Photosystem II (PS II) and Photosystem I (PS I).
  2. Be able to explain the difference between the long term control of energy distribution  and short term control of energy distribution in photosynthesis.

Study Questions:
  1. Just for background purposes, study figure 9.13 to see how the photosynthetic electron transport system is organized in the thylakoid membrane.  Note the position of PSII, PSI, LHC II, and LHC I.
  2. Describe the make-up of LHC II. (page 181)
  3. What is the role of LHC II?  (page 181)
  4. What is meant by long-term adaptations for photosynthesis energy distribution? (page 182)
  5. What are the long-term adaptations for photosynthesis energy distribution in sun and shade plants? (pages 181-182)
  6. What are sunflecks? (page 182)
  7. How can plants adapt for short-term changes in photosynthesis energy distribution? (pages 182-183)