AIM SWBAT describe the 3 steps of the

AIM: SWBAT describe the 3 steps of the light independent reactions (Calvin Cycle) Please Do Now: 1) What role does sunlight play in the electron transport chain? 2) Where do the electrons that are passed through the electron transport chain come from?

Agenda � Do Now � Video Clip � Light Independent Reactions Notes � Data Analysis � Calvin Cycle Worksheet

Light Reactions EVEN MORE BRIEFLY � Sunlight in � Chemical Energy out ◦(ATP and NADPH)

Photosynthesis

Photosynthesis

Photosynthesis Chemical Energy

ALSO KNOWN AS DARK REACTIONS What is the purpose of the Light Independent Reactions � Uses the ATP from the light reactions � Takes place is the stroma of the chloroplast (outside thylakoid, inside the chloroplast). � 3 steps: 1. carbon fixation, 2. reduction 3. regeneration

Light Independent Reactions: Step 1 � Carbon fixation ◦ The enzyme Ru. Bis. Co combines the 5 Carbon compound Ru. BP with carbon dioxide (CO 2) to make an unstable 6 carbon compound

Light Independent Reactions: Step 2 � Reduction: The unstable 6 carbon compound is split apart and reduced into 2 molecules with 3 Carbons, called G 3 P ◦ Requires ATP and NADPH

Light Independent Reactions Step 3 • Regeneration: A large array of enzymes rearrange 5 G 3 P molecules into 3 Ru. BP molecules, which start off the Calvin cycle � ATP required � 1 G 3 P can be taken out of the cycle every 3 turns, to go toward making glucose

Calvin Cylce as a whole � 1 carbon dioxide is fixed per turn of the cycle � Each turn takes 3 ATP and 2 NADPH, made in the light reactions (lots of energy!) � To make one glucose, it takes six turns of the cycle

Summarize in your own words � In the light independent reactions of photosynthesis. . .

GOOD WORK!