Lecture _10 - Photosynthesis - Light Reactions and the Calvin Cycle

Lecture _10 - Photosynthesis - Light Reactions and the Calvin Cycle

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Photosynthesis: Light Reactions and the Calvin Cycle Campbell –Reece, 8 th Edition eading Assignment: Reading Assignment: Chapter 10 BIOL 203 – Spring 2010 Ralph Feuer
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Overview: The Process That Feeds the Biosphere Photosynthesis Process that converts solar energy into chemical energy Directly or indirectly Photosynthesis ourishes almost the nourishes almost the entire living world
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Autotrophs Autotrophs Sustain themselves without eating anything derived from other organisms The producers of the iosphere biosphere Producing organic molecules from CO 2 and other inorganic molecules Almost all plants are hotoautotrophs photoautotrophs Using the energy of sunlight to make organic olecules from H and molecules from H 2 O and CO 2
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Photosynthesis Photosynthesis occurs in Plants Algae Certain protists ome prokaryotes (a) Plants Some prokaryotes (c) Unicellular protist 10 μm These organisms Feed not only emselves but also 1.5 μm 40 μm (d) Cyanobacteria (e) Purple sulfur bacteria (b) Multicellular alga themselves but also most of the living world
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Heterotrophs Heterotrophs btain eir or anic Obtain their organic material from other organisms The consumers of the biosphere Almost all heterotrophs, m p , including humans, depend on photoautotrophs For food and O 2
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Photosynthesis Converts Light Energy To he Chemical Energy Of Food The Chemical Energy Of Food Chloroplasts Structurally similar to and likely evolved from Reflected light Light hloroplast photosynthetic bacteria Chloroplast Structural organization of hese cells Absorbed Granum these cells Allows for the chemical reactions of Transmitted photosynthesis
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Chloroplasts: The Sites of Photosynthesis Plants in Plants Leaves he ajor locations of 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 chloroplast CO 2 enters and O 2 exits the leaf through microscopic pores Stomata
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Chloroplasts: The Sites of Photosynthesis Plants Chloroplasts are found mainly in cells of the mesophyll he terior tissue of the af in Plants Leaf cross section Vein The interior tissue of the leaf A typical mesophyll cell Mesophyll tomata Has 30–40 chloroplasts The chlorophyll is in the membranes f ylakoids Stomata CO 2 O 2 Chloroplast Mesophyll cell of thylakoids C onnected sacs in the chloroplast May be stacked in columns called grana Outer membrane Thylakoid g Chloroplasts also contain stroma ense fluid Intermembrane space 5 μm Inner membrane Thylakoid space ya od Granum Stroma A dense fluid Where carbohydrate formation occurs 1 μm
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Tracking Atoms Through Photosynthesis: Scientific Inquiry Photosynthesis can be summarized as the following equation: ym m f g q CO 12H + Light energy 6O 6H 6 CO 2 + 12 H 2 O + Light energy C 6 H 12 O 6 + 6 O 2 + 6 H 2 O Photosynthesis
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This note was uploaded on 03/07/2010 for the course BIO 203 taught by Professor Feuer during the Spring '10 term at San Diego State.

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Lecture _10 - Photosynthesis - Light Reactions and the Calvin Cycle

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