web_L31_08BIO311C - BIO 311C April 7, 2008 The Light...

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BIO 311C April 7, 2008
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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:
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Relationship of the Light Reactions to the Calvin Cycle of Photosynthesis * Final products of the light reactions are initial reactants for the Calvin Cycle, while final products of the Calvin Cycle are initial reactants for the light reactions.
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Illustration of the Requirement of the Light Reactions to Drive the Calvin Cycle of Photosynthesis * energy reducing units
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The Calvin Cycle (The "Dark" Reactions of Photosynthesis) * The "dark reactions of photosynthesis can operate in the light or in the dark, but do not utilize light as a substrate. Calvin Cycle
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The Calvin Cycle Shown as a Cycle (shown as four stages) Six times around the cycle produces one hexose, the form of sugar that is polymerized and stored as starch in chloroplasts. Three times around the cycle produces one triose, the form of sugar that is transported from the chloroplast to the cytoplasmic matrix for further metabolism. * Accumulation of C 3 , C 4 , C 5 , C 6 , and C 7 sugar phosphates in the stroma. 1. fixation 2. reduction 3. rearrangement 4. regeneration
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Assimilation of Carbon Dioxide into an Organic Molecule * This reaction is referred to as carbon dioxide fixation . Fixation refers to the conversion of carbon from a gaseous form into a non-gaseous form. Unstable intermediate
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This note was uploaded on 09/28/2008 for the course BIO 311C taught by Professor Satasivian during the Spring '08 term at University of Texas at Austin.

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web_L31_08BIO311C - BIO 311C April 7, 2008 The Light...

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