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Calvin Cycle

Calvin Cycle. The Calvin Cycle makes sugar from the atoms in CO 2 plus the H+ ions and electrons carried by NADPH. The Calvin Cycle takes place in the stroma The Calvin Cycle uses the ATP that was created in the Light Reactions to make sugar. Calvin Cycle.

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Calvin Cycle

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  1. Calvin Cycle • The Calvin Cycle makes sugar from the atoms in CO2 plus the H+ ions and electrons carried by NADPH. • The Calvin Cycle takes place in the stroma • The Calvin Cycle uses the ATP that was created in the Light Reactions to make sugar.

  2. Calvin Cycle • Carbon fixation: carbon dioxide is added to (fixed) into an existing 5 carbon sugar. It splits into 3 carbon sugars. • The electrons and H+ ions from NADPH are added to the 3 carbon sugars forming G3P. ATP is needed. • One G3P molecule leaves the cycle, it is the building block of glucose and other organic molecules. • The G3P is turned back into RuBP (the 5 carbon sugar we started with). ATP is required.

  3. Calvin Cycle • Inputs: CO2, NADPH, ATP • Outputs: C6H12O6 (sugar) • The sugar can be converted to sucrose, starch or cellulose. • Leaf cells can export sucrose thru veins to supply the rest of the plant with energy • The sugar can be converted to starch, which the plant can use during the night for energy. • The carbon skeletons can be used to form lipids, proteins, and other molecules the plant needs for growth or maintenance.

  4. Photosynthesis 6CO2 +12 H2O  C6H12O6 + 6O2 + 6H2O

  5. Converting sunlight to sugar • Complete Reflect & Connect #1-5 on page 334 • Read “Photosynthesis Isn’t Just For Plants” p. 335. • Why? Because it’s interesting and you’ll be able to impress your friends at parties  • Plus, I’ll put a bonus question on the next quiz from this reading.

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