1. Cellular Respiration
Adenosine Triphosphate (ATP) is the basic energy source of all cells.

2. Sunlight is the ultimate source of energy for life
Sunlight is the ultimate source of energy for life. However, it is an unusable form of energy.
Photosynthesis converts light energy into the chemical energy of carbohydrates and glucose

3. Glucose has energy stored in the bonds, but it has to be released
Respiration conversts the energy in glucose to ATP, which is the cell’s only usable energy source

4. Cellular Respiration
Cellular respiration is the process of breaking down glucose to release energy for ATP
Where does this occur?

5. Steps of Cellular Respiration
Glycolysis – one molecule of glucose is split into two pyruvic acid
Net gain of 2 ATP molecules

6. Steps of Cellular Respiration
AEROBIC RESPIRATION–
occurs after glycolysis if oxygen is present
ANAEROBIC RESPIRATION
(Fermentation)
occurs after glycolysis if oxygen is not present
Kreb’s Cycle – pyruvic acid is broken down and carbon dioxide is released
Electron Transport Chain – uses high energy electrons to produce ATP Produces a total of 34 ATP
Alcoholic Fermentation – forms ethyl alcohol and carbon dioxide as waste
Ex: yeast, makes bread rise
Lactic Acid Fermentation – forms lactic acid
Ex: bacteria, used for dairy products and this is why your muscles are sore after exercising

7. ATP
Photosynthesis
Cellular Respiration

8. The ATP Cycle
The energy in the ATP molecule is released by breaking the bond between the 2nd and 3rd phosphate groups. This results in the molecule Adenosine Diphosphate (ADP). The ADP and 3rd phosphate group is then recycled to be used in the production of more ATP.
ATP +P -P
ADP