BIO311C_F08_Chapter 10

BIO311C_F08_Chapter 10 - Photosynthesis Chapter 10...

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Unformatted text preview: Photosynthesis Chapter 10 (relevant parts) Life: the science of biology (Purves) http://science.nhmccd.edu/biol/bio1int.htm http://highered.mcgraw-hill.com/olc/dl/120072/bio12.swf iclicker • How many NADH molecules are synth per molecule of glucose at the end of the Kreb’s cycle (including glycolysis)? a)6 b)8 c)10 *** d)9 e)12 iclicker • What is the final electron accepetor in alcohol fermentation a)oxygen b)Acetaldehyde *** takes e- from NADH c)pyruvate d)B and C e)CO2 • Chloroplasts – Are the organelles in which photosynthesis occurs – Found in mesophyll cells (30-40 chloroplasts) Chloroplast Mesophyll 5 µm Outer membrane Intermembrane space Inner membrane Thylakoid space Thylakoid Granum Stroma 1 µm Thylakoid Thylakoid Thylakoid Membrane Thylakoid Space Granum • Photosynthesis is summarized as 6 CO 2 + 6H 2 O + Light energy → C 6 H 12 O 6 + 6 O 2 e- from water to carbon dioxide (being oxidized) Light Fig. 10-5-4 H 2 O Chloroplast Light Reactions NADP + P ADP i + ATP NADPH O 2 Calvin Cycle CO 2 [CH 2 O] (sugar) • The light reactions – Split water, release oxygen, produce ATP, and form NADPH • The Calvin cycle – Forms sugar from carbon dioxide, using ATP and NADPH • E carriers in glycolysis – NADH • E carriers in krebs – NADH and FADH • e- carriers in photosynthesis – NADPH • ???????????????????????????? The light reactions • The light reactions convert solar energy to the chemical energy of ATP and NADPH Photosynthetic pigments (light receptors) Main photosynthetic pigment Chlorophyll a Accessory pigment absorbs different wavelengths of light and pass energy to chlorophyll a Chlorophyll b, carotenoids Chlorophyll Molecules Chlorophyll Molecules • Located in the thylakoid membranes thylakoid membranes. • Chlorophyll have Mg Mg + in the center. • Chlorophyll pigments Chlorophyll pigments harvest energy (photons) by absorbing absorbing certain wavelengths wavelengths 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 Excitation of Chlorophyll by Light Excited state E n e r g y o f e l e c t i o n Heat Photon (fluorescence) Chlorophyll molecule Ground state Photon e – Figure 10.11 A How is this energy used in photosynthesis?How is this energy used in photosynthesis?...
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This note was uploaded on 09/13/2009 for the course BIO 159593 taught by Professor Latham during the Winter '08 term at University of Texas.

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BIO311C_F08_Chapter 10 - Photosynthesis Chapter 10...

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