2125960122

2125960122 - 1 Energy Storage/Energy consumption Lecture...

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Unformatted text preview: 1 Energy Storage/Energy consumption Lecture 13: Chp. 6, etc. Summary of Photoreactions to Photophosporylation, note gain of 2 NADPH Becker et al. The World of the Cel Alternatively ATP can be synthesized by cyclic photophosphorylation (PSI), at the expense of NADPH ATP from Photophosphorylation • For every 4 e- moving from PSII to PSI, 8 H + (photolysis & from PSII) go to thylakoid lumen. Can generate 2-3 ATP (since 1ATP is synthesized for every 3) • Plus for every 4 e- , 2 NADPH can be produced NADPH – higher energy than NADH 2 Photosynthesis the most important reaction on earth: Chemical expression 6 CO 2 + 12 H 2 O C 6 H 12 O 6 + 6 O 2 + 6 H 2 O Summary RXs in a Chloroplast: Calvin Cycle in Stroma Organization of a Leaf (C 3 ) Mesophyll cells- photosynthetic Epidermis with cutin water loss protection 3 Chloroplast: Photolysis, photophosphorylation, carbon fixation, triosphosphate cycle, starch storage 3 Stages of Carbon Cycle Taize & Zeiger 02 Gained from Light Rxs. Gained from Light Rxs. The Calvin Cycle • In the stroma of chloroplasts • Where ATP and NADPH are synthesized. • CO 2 diffuses through the membrane 3 stages of Cycle 1. Carboxylation of organic acceptor molecule; Ribulose-1,5-bisphosphate (Rubisco) 2. Reduction of 3-phosphoglycerate (PGA) to triose phosphate: glyceraldehyde-3- phosphate (GAP) 3. Regeneration of the original organic acceptor molecule The Calvin Cycle C 3 Pathway 4 Carbon Assimilation: Storage via the Calvin Benson Cycle • Fundamental pathway named for co- discoverers: Melvin Calvin/Andrew Benson • Nobel Prize in 1961 for Calvin 3-phosphoglycerate (PGA) is the first...
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This note was uploaded on 10/22/2008 for the course BSCI 207 taught by Professor Higgins during the Spring '08 term at Maryland.

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2125960122 - 1 Energy Storage/Energy consumption Lecture...

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