chp 6 notes.docx

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Biological Sciences
Course Code
Rene E Harrison

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Heterotrophs Organisms that depend on an external source of organic compounds Autotrophs Organisms capable of surviving on CO2 as their principal carbon source 2 types of autotrophs Chemoautotrophs utilize the chemical energy stored in organic molecules to convert CO2 into organic compoundsPhotoautotrophs utilize the radiant energy of the sun to convert CO2 into organic compoundsPhotosynthesis a process in which energy from sunlight is transformed into chemical energy that is stored in carbohydrates and other organic moleculesDuring photosynthesis relatively lowenergy electrons are removed from a donor compound and converted into highenergy electrons using the energy absorbed from light Extensive genetic analyses of chloroplast genomes suggest that all modern chloroplasts have arisen from a single ancient symbiotic relationship As a result of their common ancestry chloroplasts and cyanobacteria share many basic characteristics including a similar photosynthetic machinery Chloroplasts are located predominantly in the mesophyll cells of leavesChloroplasts of higher plants are general
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