Photosynthesis Light Reactions 23 - PDF

T&Z Chapter11, pp. 223 Photosynthesis 6CO2 + 12H2O → C6H12O6 + 6H2O + 6O2 Sunlight energy is a vital resource for plants T&Z Chapter11, pp. 223 Photosynthesis 6CO2 + 12H2O → C6H12O6 + 6H2O + 6O2 1. Havesting light energy 2. Biochemical reactions: carbohydrates synthesis Photosynthesis invol...

T&Z Chapter11, pp. 223 Photosynthesis 6CO2 + 12H2O → C6H12O6 + 6H2O + 6O2 Sunlight energy is a vital resource for plants T&Z Chapter11, pp. 223 Photosynthesis 6CO2 + 12H2O → C6H12O6 + 6H2O + 6O2 1. Havesting light energy 2. Biochemical reactions: carbohydrates synthesis Photosynthesis involves a series of photochemical and biochemical reactions: First step in all photochemical processes – energy must be harnessed by a pigment In plants – a range of pigments, but chlorophyll is dominant Chloroplasts Plants are green because they harvest red and blue light in their chloroplasts. The molecule that collects this light is called chlorophyll. Reece et al. (2011) Campbell Biology, 9th ed, Fig. 10.08 Chloroplasts Chloroplasts contain interconnected membranes = thylakoids. Stroma lamella Chlorophyll found in the thylakoids. Plastids have a double membrane. Reece et al. (2011) Campbell Biology, 9th ed, Fig. 10.04 Figure 7.5 Light absorption and emission by chlorophyll Figure 7.10 Basic concept of energy transfer during photosynthesis Figure 7.17 Funneling of excitation from the antenna system toward the reaction center Figure 7.13 Z scheme of photosynthesis Figure 7.20 Transfer of electrons and protons in the thylakoid membrane is carried out vectorially by four protein complexes Figure 7.15 Schematic picture of the overall organization of the membranes in the chloroplast Figure 7.28 Chemical structure and mechanism of action of two important herbicides