PHOTOSYNTHESIS Part 1 pp

How do Organisms “Eat”?  Autotrophs: Make their own carbohydrates using inorganic compound  Phototrophs: use sunlight for energy  Chemotrophs: use chemicals for Energy  Heterotrophs: get carbohydrates by eating other organisms

Photosynthesis Refresher sunlight 6CO 2 + 6H 2 O      6O 2 + C 6 H 12 O 6 Sunlight Carbon dioxide + water     oxygen + carbohydrates

Inside the Chloroplast  Thylakoids – flattened sacs inside the chloroplast  Granum – one stack of thylakoids (plural: grana)  Stroma – solution surrounding the grana

Photosynthesis – In Detail  Occurs in two parts  PART ONE: LIGHT REACTIONS  Energy is made in the form of ATP and NADPH  PART TWO: CALVIN CYCLE  Uses ATP and NADPH from the light reactions to make carbohydrates

What Powers these Processes?  ATP  H+ builds up on one side of the thylakoid  H+ moves from HIGH to LOW concentration through ATP Synthase ADP + Pi  ATP

 NADPH  NADP + + H +  NADPH  NADPH vs. ATP  Think: different sizes of batteries. They both provide energy, but for different things. What Powers these Processes?

Vocab to keep in mind:  Autotrophs  Light Reactions  Calvin Cycle  ATP and NADPH