web_L29_10BIO311C - BIO 311C Spring 2010 Exam 3: Friday 16...

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BIO 311C Spring 2010 Lecture 29 – Friday 9 Apr. 1 Exam 3: Friday 16 April Exam 3 will cover reading assignments, lecture information and presentation slides since Exam 2.
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oxidation of water occurs as a part of the light reactions of photosynthesis reduction of carbon dioxide occurs as a part of the dark reactions of photosynthesis 3 * Water is oxidized during the light reactions of photosynthesis. Carbon dioxide is reduced during the dark reactions of photosynthesis.
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Summary of the Light Reactions of Photosynthesis The most important products of the light reactions to the plant are ATP and NADPH because they are required for the dark reactions. Oxygen is a waste product. Summary of the Dark Reactions of Photosynthesis * 4
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Several hundred chlorophyll molecules occur as an organized array within a cluster of several transmembrane proteins. Thylakoid membrane Complex of several transmembrane proteins Chlorophyll molecule The Location of Chlorophyll Molecules Within Thylakoid Membranes * 5
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Chlorophyll Molecule Space-filling model (different kinds of atoms are shown in different colors) Chemical structure * The ring structure (head) of chlorophyll is polar and projects from the hydrophobic interior of thylakoid membranes. It is the portion of the molecule that absorbs light energy. The magnesium ion is required for its function. The tail of chlorophyll is nonpolar. It anchors the chlorophyll in place within transmembrane proteins by hydrophobic bonding. tail head Textbook Fig. 10.10, p. 192 Mg 2+ 6
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1. A photon of light is absorbed by any one of the chlorophyll molecules within an array. 2. The energy content of the light is transferred rapidly among the chlorophyll molecules within the array. 3. The energy eventually becomes "trapped" in a special pair of chlorophyll molecules. 4. Energized special-pair chlorophyll loses an electron to another molecule called a primary electron acceptor. This is an oxidation-reduction reaction. * Energy transfer among chlorophyll molecules does not involve any chemical reaction. Electron transfer from the “special pair” chlorophyll molecules to the primary electron acceptor is the first chemical reaction of photosynthesis. Textbook Fig. 10.12, p. 193
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web_L29_10BIO311C - BIO 311C Spring 2010 Exam 3: Friday 16...

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