1. A calorie is a unit of energy

2. The Calorie used on food labels is equal to 1000 calories

3. A Calorie is also referred to as a kilocalorie

4. Cells use the energy stored in
ATP
(They get ATP by taking in foods or storing molecules, such as fat)

5. The equation that summarizes cell respiration
Look familiar? It’s photosynthesis backwards (almost exactly)
6 H2O + 6 CO2

C6H12O6 + 6 O2

6. If cell respiration took place in one step most of the energy would be lost in the form of light and heat

7. Cell respiration begins with a pathway called glycolysis which takes place in the cytoplasm of the cell

8. At the end of glycolysis about
90 percent of the chemical energy is locked in the bonds of the pyruvic acid molecule

9. Cell respiration continues in the mitochondria of the cell with the Krebs cycle and electron transport

10. The pathways of cellular respiration that require oxygen are said to be aerobic
Pathways of cellular respiration that do not require oxygen are said to be anaerobic

11.

12. Opposite directions
Notice the products of one reaction are the reactants of the other, and vice versa!

13. Photosynthesis deposits energy in Earth’s savings account for living organisms

14. Cellular respiration removes oxygen from the air

15. Cell respiration takes place in nearly all life.
Only plants, fungi, and some bacteria use photosynthesis!

16. Comparing photosynthesis and respiration !!!!!!!!!!!!!!!
Aspect Photosynthesis Respiration
Function Captures energy
Location of reactions
Reactants
Products chloroplasts
Carbon dioxide
Water and light
Oxygen and glucose
Uses/releases energy
Cytoplasm mitochondria
Glucose and oxygen
Carbon dioxide
Water and energy

17.
• Cellular respiration – releases energy for use by cells
• Without energy, cells cannot function
• Without cells, life could not exist