1. Photosynthesis
Unit 12

2. Chemical Energy and ATP
Adenosine triphosphate
The energy molecule
Has three phosphate groups
When broken:
Becomes ADP
Releases energy
Three phosphate groups

3. NADPH Electron carrier Can create energy by sending electrons
over a concentration
gradient
Can help build important
cells

4. How Do Cells Get ATP?
Heterotrophs Get ATP by plants and animals Undergo cellular respiration Autotrophs Get ATP from sunlight Undergo photosynthesis

5. Photosynthesis Light energy Chemical energy
Occurs in the chloroplast of a plant cell
The photosynthesis reaction happens with chlorophyll (green plant pigment)

6. Photosynthesis Formula
6CO2 + 6H2O + light  C6H12O6 + 6O2 Carbon dioxide + Water + light  Sugars + oxygen

7. The Two Photosynthesis Reactions
Light Reaction
Uses light energy to make ATP
Water is required
Oxygen in a by-product
Dark Reaction
Carbon dioxide is absorbed
ATP and NADPH work to make sugar
No light is required

8. Light and Dark Reactions
Light and Dark Reactions