1. Cellular Respiration
Do Now : Why do we need to breathe?

2. Equation Reactants Products Oxygen + Glucose
Carbon dioxide + Water + ATP 2
Reactants Products
Energy is released when glucose is broken down. CO2 is released as a waste gas.
Which side is the reactants and which side is the products?

3. 2 Kinds of Cellular Respiration
Aerobic: Occurs in the presence of oxygen
Anaerobic: Occurs when no oxygen is present.

4. Aerobic Respiration 3 stages Glycolysis Krebs cycle
Electron Transport Chain

5. Glycolysis First stage in cellular respiration
Only stage that does not require O2
There is no net gain or loss of C because one 6-C molc (glucose) is broken into two 3-C mole (pyruvate) for a total of 6 Carbons.

6. Requires 2ATPs to start. End Product = 4 ATP Net Gain: 2 ATP
One cell can produce thousands of ATP molecules in a few milliseconds!!!
The net gain of ATP is small, but the cell can make many ATP in a very short period of time. And, because glycolysis does not require Oxygen, it can occur in anaerobic conditions.

7. REVIEW: What is the purpose of glycolysis?
To break down glucose

8. Krebs Cycle CO2 is released as a waste gas Requires O2 Occurs in
mitochondria
Produces 2 ATPs

9. Electron Transport Chain
ADP is converted into ATP
Up to 34 ATPs can be produced

10. Aerobic respiration yields a net total of 36-38 ATPs

11. Question:
Which step of aerobic respiration produces the most ATPs (most efficient step)?
ETC- Electron Transport Chain

12. Question :
In what part of the cell aerobic respiration takes place?
Mitochondria

13. • identify the organelle where this process occurs
AIM : Fermentation
Do Now Discuss photosynthesis and explain its importance to an organism. In your answer, be sure to:
• identify the organelle where this process occurs
• identify two raw materials necessary for this process
• identify one energy-rich molecule that is produced by this process
• state how organisms use the energy-rich molecule that is produced
• state how a gas produced by this process is recycled in nature

14. Fermentation Anaerobic process: occurs in absence of O2.
Recycles NAD+ ,so that glycolysis can continue producing 2ATPs for every round.
Does not produce any ATP

15. 2 kinds of fermentation:
Alcoholic Fermentation
Lactic Acid Fermentation

16. Alcoholic Fermentation+ 2
Ex: Yeast in Bread
Bread rises due to yeast fermentation. The alcohol produced evaporates when the bread is cooked.

17. Lactic Acid Fermentation+
Produced in muscle cells during exercise when body is no longer able to supply O2 to cells.
When exercising, it is important to maintain a constant breathing rate (and not hold your breath) because your body cells are supplied at a more constant rate with oxygen. This helps to limit the amount of lactic acid produced because cells are with oxygen longer.
Some bacteria also produce lactic acid as a waste product during cellular respiration. Prokaryotic organisms are used to make cheese, yogurt, buttermilk, sour cream, pickles, and sauerkraut.