1. Section 8-1
Energy and Life

2. Autotrophs vs. Heterotrophs
Autotrophs – organisms, such as plants that make their own food.
Heterotrophs – organisms, such as animals, that must consume food in order to obtain energy.

3. Adenosine Triphosphate (ATP)
Adenosine Triphosphate (ATP) – chemical compound that cells use to store and release energy
Consists of adenine, a 5-carbon sugar called ribose, and three phosphate groups.

4. ATP (cont)
Energy is released by breaking the chemical bond between the second and third phosphates.

5. 9.2 Photosynthesis: Trapping the Sun’s Energy
Process plants use to trap the sun’s energy and build glucose that store energy
6CO2 + 6H2O → C6H12O6 + 6O2
carbon + water glucose + oxygen
dioxide (sugar)

6. Photosynthesis occurs in the chloroplasts.
Chloroplasts contain the pigment chlorophyll. Chlorophyll molecules trap the sunlight so photosynthesis can occur.

7. 9.3 Getting Energy to Make ATP
Cellular Respiration
Process by which mitochondria break down food to produce ATP.
Converts glucose to carbon dioxide and water.
C6H12O6 + O2→CO2 + H2O

8. Aerobic vs. Anaerobic Respiration
Anaerobic – does not require oxygen
Aerobic – does require oxygen

9. Photosynthesis and cellular respiration are opposite processes.
The reactants of one process are the products of the other