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Lec8notescomplete - Bio1A Lec 8 Complete Notes Chapter 10:...

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Bio1A Lec 8 Complete Notes 1 Chapter 10: Photosynthesis Photosynthesis D Photosynthesis is the process that converts solar energy into chemical energy D Directly or indirectly, photosynthesis nourishes almost the entire living world D Autotrophs sustain themselves without eating anything derived from other organisms D Autotrophs are the producers of the biosphere, producing organic molecules from CO 2 and other inorganic molecules D Almost all plants are photoautotrophs , using the energy of sunlight to make organic molecules from water and carbon dioxide Producers D Photosynthesis occurs in plants , algae , certain other protists , and some prokaryotes D These organisms feed not only themselves but also the entire living world Fig. 10-2 Consumers D Heterotrophs obtain their organic material from other organisms D Heterotrophs are the consumers of the biosphere D Almost all heterotrophs, including humans, depend on photoautotrophs for food and oxygen Chloroplasts D Chloroplasts are organelles that are responsible for feeding the vast majority of organisms D Chloroplasts are present in a variety of photosynthesizing organisms D Leaves are the major locations of photosynthesis D Their green color is from chlorophyll , the green pigment within chloroplasts. Light energy absorbed by chlorophyll drives the synthesis of organic molecules in the chloroplast D Through microscopic pores called stomata , CO 2 enters the leaf and O 2 exits Mesophyll D Chloroplasts are found mainly in cells of the mesophyll , the interior tissue of the leaf D A typical mesophyll cell has 30-40 chloroplasts D The chlorophyll is in the membranes of thylakoids (connected sacs in the chloroplast); thylakoids may be stacked in columns called grana D Chloroplasts also contain stroma , a dense fluid Fig. 10-3 Overall reaction D Photosynthesis can be summarized as the following equation: 6 CO 2 + 12 H 2 O + Light energy C 6 H 12 O 6 + 6 O 2 + 6 H 2 O D Chloroplasts split water into hydrogen and oxygen , incorporating the electrons of hydrogen into sugar molecules D Photosynthesis is a redox process in which water is oxidized and carbon dioxide is reduced Fig. 10-4
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Bio1A Lec 8 Complete Notes 2 A Preview of Photosynthesis: D Photosynthesis consists of the light reactions (the photo part) and Calvin cycle (the synthesis part) D The light reactions (in the
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This note was uploaded on 09/16/2010 for the course BIO 1A taught by Professor Mccray during the Fall '09 term at Merritt College.

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Lec8notescomplete - Bio1A Lec 8 Complete Notes Chapter 10:...

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