BSC 300 Lecture Notes - Lecture 11: Inner Membrane, Pheophytin, P700
9 May 2016
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Bsc 300 lecture 11- photosynthesis & the chloroplast. The earliest living organisms were heterotrophs, which survived on nutrients from the environment. Autotrophs manufacture organic nutrients from co2 and h2s. Synthesis of complex molecules from co2 requires a large input of energy and reducing power. Photoautotrophs use radiant energy to make organic compounds. Photosynthesis converts solar energy sunlight into chemical energy stored in carbohydrates. About 2. 7 million years ago, cyanobacteria evolved the ability to split water and use its electrons producing oxygen as a waste product: Light + co2 + h2o (cid:0) (ch2) + o2. Outer membrane: porins make it permable to large molecules. Inner membrane: impermeable; transporters move molecules into interior. Thylakoid membrane: houses critical enzyme complex that drive photosynthesis. Thylakoid membranes have high percentage of glycolipids: makes membrane very fluid for diffusion of proteins complexes. Interior of chloroplasts is the stoma: contains the enzymes responsible for carbohydrate synthesis. Thylakoids: flattened membrane bound sacs where light reactions occur.
