B1510_F07_photosynth - Photosynthesis Overview: role of...

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Photosynthesis Overview: role of photosynthesis in energy and biogeochemistry Light as energy and capturing light energy Light reactions and the products Carbon fixation reactions Calvin-Benson cycle Rubisco C3 vs C4
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Where does a tree get its biomass? Q: Plant a seedling in a large pot with 200 lbs of soil. Water daily for 5 years. The tree now weighs 150 lbs. The soil is carefully recovered, dried and weighed. How much will the soil weigh? A. About 200 lbs B. About 150 lbs C. About 100 lbs D. About 50 lbs
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Q: The biomass of the tree comes primarily from: a) Soil b) Water c) Air
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Chapter 10 - Photosynthesis • 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 Reverse of respiration: C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O
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Photosynthesis: light energy to fix CO 2 and split water; make carbohydrates and oxygen
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Photosynthetic bacteria – note the infolded membranes cyanobacterium Ectothiorhodospira
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Q: Which experiment will produce 18 O 2 ? a. Expt 1 b. Expt 2 c. Both Expt 1 and Expt 2 d. Neither Figure from Purves et al., 7 th ed.
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Photosynthesis consists of light reactions ( photophosphorylation ) and carbon fixation ( Calvin-Benson cycle ) th ed.
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Light is energy: E = h ν Wavelength and frequency are inversely related: ν = c/ λ h is Planck's constant
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Visible light is a portion of the EM spectrum
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Absorption spectra for chlorophylls match photosynthetic action spectrum th ed.
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Molecular structure of chlorophyll Chlorophyll absorbs energy from photons or neighboring excited chlorophyll molecules (Chl*). Chl* is a good reducing agent.
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Noncyclic photophosphorylation (Z-scheme) uses two photosystems: PSI and PSII Light + H 2 O + NADP + + ADP + Pi NADPH + H + + ATP + 1/2O 2
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Noncyclic electron flow
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Chemiosmotic ATP synthesis in chloroplasts resembles that in mitochondria Electron transport chains are located on the inner mitochondrial and thylakoid membranes.
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Protons are pumped into the thylakoid interior
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This note was uploaded on 04/07/2008 for the course BIO 1510 taught by Professor Unknown during the Fall '07 term at Georgia Institute of Technology.

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B1510_F07_photosynth - Photosynthesis Overview: role of...

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