Chapter%2010

Chapter%2010 - Most (but not all) life on earth depends on...

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Most (but not all) life on earth depends on energy from the sun.
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Reactants: Fig. 10-4 6 CO Products: 12 H O 6 O 6 H O C H O In cellular respiration , glucose is converted to CO 2 and water by transferring electrons to O 2 thereby releasing lots of energy. In photosynthesis , electrons are stripped off of water and transferred to CO 2 to reduce carbon to the carbohydrate level. This process requires lots of energy and releases O 2 as a byproduct.
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(a) Plants (c) Unicellular protist 10 µm 1.5 µm 40 µm (d) Cyanobacteria (e) Purple sulfur bacteria (b) Multicellular alga Primary producers use photosynthesis to capture the sun’s energy and reduce CO 2 to carbohydrate.
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Fig. 10-3b 1 µm Thylakoid space Chloroplast Granum Intermembrane space Inner membrane Outer membrane Stroma Thylakoid In green plants and multicellular algae, photosynthesis occurs in chloroplasts.
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Fig. 10-17 Light Fd Cytochrome complex ADP + i H + ATP P ATP synthase To Calvin Cycle STROMA (low H + concentration) Thylakoid membrane THYLAKOID SPACE (high H + concentration) STROMA (low H + concentration) Photosystem II Photosystem I 4 H + 4 H + Pq Pc Light NADP + reductase NADP + + H + NADPH +2 H + H 2 O O 2 e e 1 / 2 1 2 3 Preview of where we are going with all of this.
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Fig. 10-10 Porphyrin ring: light-absorbing “head” of molecule; note magnesium atom at center in chlorophyll a CH 3 Hydrocarbon tail: interacts with hydrophobic regions of proteins inside thylakoid membranes of chloroplasts; H atoms not shown CHO in chlorophyll b
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Fungi EUKARYA Trypanosome s Green algae Land plants Red algae Forams Ciliates Dinoflagellates Diatoms Animals Amoebas Cellular slime molds Leishmania Euglena Green nonsulfur bacteria Thermophiles Halophiles Methanobacterium Sulfolobus ARCHAEA COMMON ANCESTOR OF ALL LIFE BACTERIA (Plastids, including chloroplasts) Green sulfur bacteria (Mitochondrion) Cyanobacteria Chlamydia Spirochetes Mitochondria and Chloroplasts are ancient microbial endosymbionts
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Fig. 25-9-4 Ancestral photosynthetic
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Chapter%2010 - Most (but not all) life on earth depends on...

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