LIFE 120 Lecture Notes - Lecture 8: Photosynthetic Pigment, Thylakoid, Photosystem Ii
Document Summary
Autotrophs: producers-generate organic molecules from co2 and inorganic molecules, photoautotrophs- use sunlight to make organic molecules from h2o and co2. Heterotrophs: obtain organic material from other organisms, consumers- depend on phototrophs for food and o2. Almost all the energy to power life comes from the sun. Mostly, photosynthetic organisms are the base of the food chain: both chloroplasts and mitochondria. Chlorophyll (harvests light energy)- in thylakoid membranes. H2o is oxidized and co2 is reduced. H2o is split to provide a source of electrons from h+, releasing o2 as the byproduct. Early cells that used light make chos from co2 oxidized h2s or fe compounds. Break- through came with splitting of h2o for organic compound synthesis with release of o2. Light reactions (the photo part: occurs in thylakoids, split h2o and releases o2, uses light energy to. Generate atp by phosphorylation: calvin cycle (the synthesis part) Uses atp and nadph to carry out carbon fixation- converts co2 to.
