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Warm-up

Warm-up. Where do the light-dependent reactions take place? Where do free e - s first gain E from the sun during the light-dependent reactions? Where do the free e - s come from? How do the free electrons use their E going from psII to psI? What molecule do the free e - s become a part of?

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Warm-up

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  1. Warm-up • Where do the light-dependent reactions take place? • Where do free e-s first gain E from the sun during the light-dependent reactions? • Where do the free e-s come from? • How do the free electrons use their E going from psII to psI? • What molecule do the free e-s become a part of? • What molecule is made from H+ going down its concentration gradient? a. What is the name of the enzyme they travel through?

  2. The Calvin Cycle • Happens in the stroma, does not require light, but does require the products from the light-dependent reactions • Converts high-E molecules (ATP & NADPH) to sugars • This is where CO2 comes in

  3. Summary of the Calvin Cycle • 6 CO2 molecules enter from the atmosphere & combine with 6 5-C molecules • 6C + 6x5C = 36C • They are converted into 12 3-C molecules • 12 x 3C = 36C • The 3-C molecules convert to higher E forms by taking E from ATP ( ADP) & NADPH ( NADP+) • 2 of the 3-C molecules convert to 6-C sugars (glucose) • The other 10 3-C molecules convert back into 5-C molecules to be used in step 1 • 10 x 3-C = 30C • 6 x 5-C = 30C

  4. Equation of Photosynthesis • Light-dependent Reactions ADP + NADP+ + energy + H2O  ATP + NADPH + O2 • Calvin Cycle ATP + NADPH + CO2  ADP + NADP + + C6H12O6 • Together: ADP + NADP+ + energy + H2O + ATP + NADPH + CO2 ATP + NADPH + O2+ ADP + NADP + + C6H12O6 • Overall: (6) CO2 + (6) H2O + energy C6H12O6 + (6) O2 Carbon + water + light  sugar + oxygen dioxide

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