1. Photosynthesis and Cellular RespirationSection 2 Energy in Living Systems Calvin Cycle CH 6 pg 120

2. Photosynthesis and Cellular RespirationSection 2 Factors that Affect Photosynthesis Light intensity (Electron Transport Chain) Carbon dioxide concentration (Calvin Cycle) Temperature (enzymes)

3. Photosynthesis and Cellular RespirationSection 2 Producing Sugar (Calvin Cycle) The first two stages of photosynthesis depend directly on light to make ATP and NADPH. In the final stage of photosynthesis, ATP and NADPH are used to produce energy-storing sugar molecules from the carbon in carbon dioxide.

4. Photosynthesis and Cellular RespirationSection 2

5. Photosynthesis and Cellular RespirationSection 2 Calvin Cycle (continuous process) CO 2 diffuses into the stroma Carbon Fixation, an enzyme (RuBisCo) adds CO 2 to a carbon molecule ATP and NADPH use their energy to drive these reactions to create molecules of G3P (3 carbon) –G3P are used to create sugar molecules to store energy for later use

6. Photosynthesis and Cellular RespirationSection 2 G3P PGAG3P RuBP G3P

7. Photosynthesis and Cellular RespirationSection 2

8. Photosynthesis and Cellular RespirationSection 2 Calvin Cycle (for more information) More description and explanation of Calvin Cycle are on the following slides.

9. Photosynthesis and Cellular RespirationSection 2 Calvin Cycle CO 2 diffuses into the stroma The enzyme (RuBP) adds CO 2 to a 5 carbon molecule This occurs several times to make a 6 carbon molecule –splits into 2 – 3 carbon molecules (PGA)

10. Photosynthesis and Cellular RespirationSection 2 G3P PGAG3P RuBP G3P

11. Photosynthesis and Cellular RespirationSection 2 Each of PGA is converted/made into G3P One G3P molecule leaves the Calvin Cycle to be used to make carbohydrates The remaining G3P molecules are recycled back to the enzyme RuBP and reenters the Calvin Cycle

12. Photosynthesis and Cellular RespirationSection 2 G3P PGA G3P RuBP G3P

13. Photosynthesis and Cellular RespirationSection 2 Each of PGA is converted/made into G3P –G3P is a molecule with additional phosphate and H + that were donated by ATP and NADPH –ADP and NADP are then recycled to the ETC One G3P molecule leaves the Calvin Cycle to be used to make carbohydrates The remaining G3P molecules are recycled back to the enzyme RuBP and reenters the Calvin Cycle

14. Photosynthesis and Cellular RespirationSection 2 Relationship