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AP Biology Ch. 10 • Is everywhere (Light is a form of electromagnetic radiation)… • All energy on earth comes from the sun* • To convert light energy into chemical energy we depend on: • Plants (chloroplasts) • Protists (chloroplasts) • Cyanobacteria (cell membrane) • Mesophyll cells: • Contain many chloroplasts for photosynthesis • Stoma cells: • Guard cells allow for gas exchange • Thylakoids: • Disk-like structures filled with chlorophyll • Stroma • Surrounding fluid • A pigment which absorbs electromagnetic radiation • Absorbs two wavelengths of light: • Blue: 420 nm • Red: 660 nm CO2 + H2O C6H12O6 + O2 carbon dioxide + water glucose + oxygen • Sunlight strikes the PSII and excites electrons • Excited electron splits H2O into H+ ions and O2 gas • Electrons flow through a series of membrane proteins moving H+ ions across the membrane • Sluggish electrons receive another photon of light in PSI • Excited electrons are passed to NADP changing into NADPH • Collection of H+ ions pass through ATP synthase • ADP is converted into ATP • http://highered.mcgrawhill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/007243 7316/120072/bio13.swf::Photosynthetic%20Electron%20Transport%20and %20ATP%20Synthesis • NADPH & ATP generated in light reactions run the Calvin Cycle • CO2 is converted into G3P through a series of reactions • Many cycles produce glucose (C6H12O6) in stroma • http://highered.mcgrawhill.com/sites/0070960526/student_view0/chapter5/animatio n_quiz_1.html Average: • http://www.youtube.com/watch?v=ytLJFYyfLV8&safety_mode =true&persist_safety_mode=1 Awesomeness: • http://www.youtube.com/watch?feature=endscreen&NR=1&v= x-t0sGyjfto