TAILIEUCHUNG - Lecture Biology: Chapter 10 - Niel Campbell, Jane Reece

Chapter 10 introduce to photosynthesis. Learning objectives of this chapter include: Describe the structure of a chloroplast; describe the relationship between an action spectrum and an absorption spectrum; trace the movement of electrons in linear, noncyclic electron flow; trace the movement of electrons in cyclic electron flow;. | Chapter 10 Photosynthesis Photosynthesis: The Energy Transfer Process That Feeds the Biosphere Photosynthesis is an energy transfer process that converts solar energy into chemical energy. Directly or indirectly, photosynthesis nourishes almost the entire living world. Photosynthesis is the key to Earth’s food and atmospheric oxygen. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Autotrophs “self feeders” make their own food. Autotrophs sustain themselves without eating anything derived from other organisms. Autotrophs are the producers of the biosphere, producing organic molecules (C-H-O) from CO2 and other inorganic molecules. Almost all plants are photoautotrophs, using the energy of sunlight to make organic molecules (C-H-O) from H2O and CO2 Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Autotrophs = Producers (a) Plants (c) Unicellular protist 10 µm µm 40 µm (d) Cyanobacteria (e) Purple sulfur bacteria (b) Multicellular alga Figure Photoautotrophs Heterotrophs obtain their organic material from other organisms. They eat (-vores) Heterotrophs are the consumers of the biosphere. Almost all heterotrophs, including humans, depend on photoautotrophs for food and O2 Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Photosynthesis converts light energy to the chemical energy of food (C-H-O) Chloroplasts are structurally similar to and likely evolved from photosynthetic bacteria: cyanobacteria. The structural organization of these cells allows for the chemical reactions of photosynthesis. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Chloroplasts: The Sites of Photosynthesis in Plants Leaves are the major locations of photosynthesis. Their green color is from chlorophyll, the green pigment within chloroplasts. Light energy absorbed by chlorophyll drives the synthesis of organic molecules in the .

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