web_L30_10BIO311C - BIO 311C Spring 2010 Exam 3: Friday,...

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BIO 311C Spring 2010 Lecture 30 – Monday 12 Apr. Exam 3: Friday, Apr. 16, in this classroom 1 The last 30 minutes of Wednesday’s lecture period will be devoted to a review of the topics covered since Exam 2.
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Summary of the Light Reactions of Photosynthesis noncyclic electron transport and photophosphorylation: sum - when cyclic and noncyclic electron flow occur in a 1:1 ratio: * Thus, a 1:1 ratio of cyclic PHP to noncyclic PHP produces a ratio of 2 NADH : 3 ATP, the ratio required for operation of the Calvin Cycle. cyclic photophosphorylation (resulting from cyclic electron transport): 3
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Overview of light harvesting, noncyclic electron transport and noncyclic photophosphorylation in photosynthesis, shown as the traditional "Z-Scheme“. From textbook Fig. 10.13, p. 195 The Z-scheme does not attempt to show the actual position of the components in the thylakoid membrane, but instead illustrates the energy level of electrons transported through the system at each component during operation of the light reactions. * 5
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Textbook Fig. 10.15, p. 196 energy of electrons * Overview of light harvesting by PS I, cyclic electron transport and cyclic photophosphorylation in photosynthesis. 6 PS 2 temporarily inactivated light
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Summary of the Light Reactions of Photosynthesis, Showing Initial Reactants and Final Products Stoichiometrically * The production of 1 molecule of glucose (hexose) in the Calvin Cycle requires 12 NADPH and 18 ATP, which must be generated by the light reactions of photosynthesis. The illustration above shows the number of quanta of light and number of substrates that are utilized in the light reactions in order to produce the correct number of NADPH and ATP molecules. Photosystem 2 Photosystem 1 7
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The Light Reactions of Photosynthesis (simplified) The Dark Reactions of Photosynthesis (simplifie d) * The ratio of products of the light reactions is: The ratio of reactants required in the dark reactions (Calvin Cycle) is: 9
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the Calvin Cycle of Photosynthesis * Products of the light reactions are reactants for the Calvin Cycle, while products of the Calvin Cycle are reactants for the light reactions. Heat is shown as a product since photosynthesis is only approximately
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This note was uploaded on 06/11/2010 for the course BIO 48765 taught by Professor Sathasvian during the Spring '10 term at University of Texas at Austin.

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web_L30_10BIO311C - BIO 311C Spring 2010 Exam 3: Friday,...

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