1. Chapter 8
Photosynthesis

2. Autotrophs vs. Heterotrophs
8-1 Energy & Life
Autotrophs vs. Heterotrophs
Autotrophs – Organism which make their own food.
2 types of Autotrophs
Photosynthetic: Convert light energy into food energy
Ex. – Green plants
Chemosynthetic: Convert Chemicals (SO2 & CH4) into food energy
Ex. – Chemosynthetic Bacteria

3. Autotrophs vs. Heterotrophs
8-1 Energy & Life
Autotrophs vs. Heterotrophs
Heterotrophs – Obtain energy from the foods they consume
Must eat autotrophs or something that has eaten an autotroph

4. 8-1 Energy & Life Chemical Energy & ATP ATP – Adenosine Triphosphate
Basic energy molecule for all cells
Composed of Adenine, Ribose, & 3 Phosphate groups
ADP – Adenosine Diphosphate
Same composition as ATP but with 2 Phosphate groups

5. ATP
Section 8-1
Adenine
Ribose
3 Phosphate groups
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6. Figure 8-3 Comparison of ADP and ATP to a Battery
Section 8-1
ADP
ATP
Energy
Energy
Adenosine diphosphate (ADP) + Phosphate
Adenosine triphosphate (ATP)
Partially
charged
battery
Fully
charged
battery
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7. ATP

8. 8-1 Energy & Life ATP & Glucose
Cells only have a few second supply of ATP
Cells can regenerate ATP from ADP as needed by using energy in glucose
Glucose contains 90 times the chemical energy of a molecule of ATP