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Figure 14.26

Figure 14.26. To maximize light absorption, Halobacterium salinarium archaea pack their entire cell membrane with bacteriorhodopsin. - The protein forms trimers that pack in hexagonal arrays, forming the “purple membrane.”. Phototrophy. Figure 14.27.

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Figure 14.26

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  1. Figure 14.26

  2. To maximize light absorption, Halobacterium salinarium archaea pack their entire cell membrane with bacteriorhodopsin. - The protein forms trimers that pack in hexagonal arrays, forming the “purple membrane.” Phototrophy Figure 14.27

  3. Each type of chlorophyll contains a characteristic chromophore, light-absorbing electron carrier. Chlorophylls - Chlorophyll molecules differ slightly in their substituent groups around the ring. - These slight differences alter their absorption spectra. Figure 14.29

  4. Figure 14.31

  5. In purple bacteria, the efficiency of photon uptake is increased even more by the presence of thylakoids. - Extensive backfolding of the photosynthetic membranes in oval pockets Figure 14.32

  6. Figure 14.35

  7. Figure 14.34

  8. Figure 14.33

  9. Figure 14.36

  10. Animation: Oxygenic Photosynthesis Oxygenic Z Pathway Click box to launch animation

  11. Overview of the Calvin Cycle Figure 15.5

  12. Rubisco consists of small (S) and large (L) subunits. - Catalyzes the condensation of CO2 to ribulose 1,5-bisphosphate, and the splitting of the unstable 6C intermediate into two 3C PGA molecules Mechanism of Rubisco Figure 15.6AB

  13. Many organisms contain the Rubisco complex within polyhedral structures called carboxysomes. The carboxysome takes up bicarbonate (HCO3–), which is then immediately converted to CO2 by carbonic anhydrase. Carboxysomes Contain Rubisco - The CO2 is then fixed by Rubisco. Figure 15.8

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