BIOL 1020 Lecture Notes - Energy Carrier, Light-Dependent Reactions, Thylakoid
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BIOL 1020 Full Course Notes
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Document Summary
Photosynthesis is the ability to capture sunlight energy and convert it to chemical energy stored in complex organic molecules, releasing oxygen as a by-product. Light reactions: chlorophyll and other pigments of the thylakoids capture sunlight, sunlight energy is converted to the energy carrier molecules atp energy. and nadph, oxygen gas: by-product, doesn"t deal with carbon dioxide, doesn"t deal with oxygen. Two types: ps i: has a chl a absorption peak at 700 nm (p700, ps ii: has a chl a absorption peak at 680 nm (p680) Thylakoid membrane: light captured by pigments in psii and psi, reactions. Water split into o2, providing energized electrons. Linear electron flow: primary pathway, involve both photosystems, produce atp and nadph. Cyclic electron flow: purple sulfur bacteria, others, use on psi, produce atp, but not nadph, no o2 released. Summary of light reactions: in the thylakoid, light energy-> atp + nadph, water splitting: H20 -> 1/2 o2 + 2h+ 2e-
