1. 8.1 - Energy & Life
metabolism: all the chemical reactions carried out by an organism
chemical reactions obtain and use energy to run the processes of life
either build molecules OR break them down to get the energy stored in those molecules 1

2. Almost all of the energy needed for metabolism comes from the sun.2

3. Candles release energy as HEAT & LIGHT
energy takes many forms - light, heat, electrical, chemical, & mechanical
energy can be changed from one form to another
energy can be stored in chemical bonds & then released later
Candles release energy as HEAT & LIGHT 3 3

4. ATP = Cellular Energy ATP stands for Adenosine Triphosphate
contains two, high-energy phosphate bonds
also contains the nitrogen base adenine & a ribose sugar 4

5. principal molecule used to store energy in living organisms
Importance of ATP
principal molecule used to store energy in living organisms 5

6. Releasing Energy From ATP
ATP is constantly being used and remade by cells
WHY? ATP provides ALL the energy for cell activities
The high energy phosphate bonds can be BROKEN to release energy 6

7. One phosphate bond has been removed
ADP
ADP stands for Adenosine Diphosphate
One phosphate bond has been removed 7

8. Releasing Energy From ATP
Adding a phosphate group to ADP stores energy in ATP
Removing a phosphate group from ATP releases energy & forms ADP
Lose
Gain 8

9. Autotrophs Autotrophs are organisms that make their own food
Autotrophs can use the sun’s energy directly.
Euglena 9 9

10. photosynthesis: process where light energy is converted to chemical energy for metabolism10

11. Heterotrophs
Heterotrophs are organisms that can NOT make their own food.
Heterotrophs can NOT directly use the sun’s energy. 11 11

12. cellular respiration: process where energy in food is released to make ATP12