1. DO NOW In yesterdays lab what did we use as our source of CO2?
What is needed for photosynthesis to occur?
What was a better source of light, the windowsill or the artificial light source? Why?

2. Chemical Energy and Food

3. What is a calorie?

4. Calorie – the amount of energy needed to raise 1 gram of water 1 degree Celsius.

5. Cellular Respiration
Process of releasing energy from food (Glucose) when oxygen is present.

6. The Equation Products? Reactants?
6 O2 + C6H12O CO2 + 6 H2O + Energy
Products?
Reactants?

7. Familiar? 6 CO2 + 6 H2O light C6H12O6 + 6 O2
Energy + 6 CO2 + 6 H2O C6H12O6 + 6 O2

8. Three parts to cellular respiration
Glycolysis
Kreb’s Cycle
Electron Transport Chain

9. Glycolysis
Glucose enters the first stage. Only a small amount of energy is used to make ATP

10. Kreb’s Cycle
2. Pyruvic acid enters the Krebs cycle, more energy is given off to make ATP.

11. Electron Transport Chain
3. Electron Transport Chain – the majority of energy comes from this stage. Uses O2 and reactants from first two stages.

12. DO NOW – collected! Where do heterotrophs get their energy from?
How many Carbon atoms does a glucose molecule have?
What are the three phases of cellular respiration?
What is a calorie?

13. Aerobic vs. Anaerobic

14. Aerobic
Aerobic – with oxygen (in air) Krebs cycle and Electron Transport Chain

15. Anaerobic
Anaerobic – without oxygen (no air) Gylcolysis

16. Mitochondria

17. Cellular Respiration

18. Glycolysis A 6 carbon sugar is split in two. This
creates 2, 3 Carbon Pyruvic Acids.
Energy is released.
2 ATP molecules are needed to power
this reaction and 4 ATP molecules are
made, this is a NET gain of 2 ATP’s.

19. Glycolysis
NAD+ converts to NADH by adding
electrons.

20. Glycolysis
ATP and NADH are the products of
Glycolysis.

21. Kreb’s Cycle
The second stage of cellular respiration in which pyruvic acid is broken down into CO2 .

22. Where does the Kreb’s Cycle take place?
Pyruvic acids moves from cytoplasm and into the mitochondria. It pases two membranes and goes into the MATRIX.

23. The Matrix is the innermost space inside the Mitochondria

24. The Matrix is the innermost space inside the Mitochondria

25. Electron Transport Chain
Inside the mitochondria where “energy” from glycolysis and the Krebs cycle change ADP into ATP.

26. Electron Transport Chain
High energy electrons are passed from one carrier to the next. This creates a positive energy build up in the matrix.

27. Electron Transport Chain
The energy in the matrix is used to turn ADP into ATP through a protein (enzyme) called ATP synthase.

28. NET RESULT -TOTALS
1 molecule of glucose can create 36 molecules of ATP. This process is 36% efficient. Where does the extra energy go?