1. BIOZONE: 85-87 Text: 102 Digital Text: 47
Sponge: Set up Cornell Notes on pg. 23
Topic: 8.2 Other Aspects of Cellular Respiration
Essential Question: None.
2.8 Other Aspects of Cellular Respiration
Key Vocabulary:
Alcoholic Fermentation
Lactic Acid Fermentation
BIOZONE: 85-87
Text: 102
Digital Text: 47

2. Objective
SWU: SW:

3. P. 20
Alcoholic Fermentation picture
Lactic Acid Fermentation picture

4. Understandings:
Anaerobic respiration gives a small yield of ATP from glucose

5. Anaerobic Respiration
All pathways of cellular respiration start with glycolysis

6. Anaerobic Respiration

8. Anaerobic Respiration
Fermentation: the breakdown of organic molecules for ATP production in an anaerobic way (without the use of oxygen)
Aerobic
Draw a small picture on p. 21
Anaerobic Cellular Respiration

9. Aerobic Respiration
In the presence of oxygen, the pyruvate will enter the link reaction and Kreb’s cycle
ETC

10. Anaerobic Respiration
If NO oxygen is available there are two anaerobic pathways that the pyruvate can enter:
Alcoholic fermentation
Yeast
Higher plant cells
Lactic acid fermentation
Animals

11. Alcoholic Fermentation
1. Glycolysis occurs first (net gain 2 ATP- 2 pyruvate)
2. The 3-carbon pyruvates are converted into molecules of ethanol
Ethanol is a 2-carbon molecule that will be released as waste
3. A carbon atom is “lost”
Given off as a waste CO² molecule

12. Alcoholic Fermentation
Draw on top of
p. 20
Ethanol
glycolysis
Ethanol

13. Ex:
Yeast is added to baker’s bread as the generation of CO² molecules helps the dough rise- the CO² and ethanol are both given off as waste products
It is also common to use yeast in the production of ethanol as drinking alcohol

14. Understandings:
Lactate production in humans when anaerobic respiration is used to maximize the power of muscle contractions

15. Lactic Acid Fermentation
Organisms that use an aerobic cell respiration pathway sometimes find themselves in a metabolic situation where they cannot supply enough oxygen to their cells

16. Lactic Acid Fermentation
Ex: A person pushing beyond their normal exercise pattern or routine
In this situation, the person’s pulmonary and cardiovascular systems (lungs and heart) supply as much oxygen to their cells as is physically possible
If a person’s exercise exceeds their capacity of supplying oxygen, then at least some of the glucose entering into cellular respiration will follow the anaerobic pathways called lactic acid fermentation

17. Lactic Acid Fermentation
Glycolysis first (net gain 2 ATP- 2 pyruvate)
In a low-oxygen situation excess pyruvate molecules are converted into lactic acid molecules
Lactic acid molecules are 3-carbon molecules (so there is no production of CO²)

18. Lactic Acid Fermentation
What benefit does this serve?
It allows glycolysis to continue with the small gain of ATP generated in addition to the ATP which is already being generated through the aerobic pathway

19. Lactic Acid Fermentation
Draw on bottom of
p. 20

20. Aerobic Cell Respiration is the most Efficient!!!
Which type of respiration is the MOST efficient? Aerobic v Anaerobic.
Aerobic Cell Respiration is the most Efficient!!! v.

21. Application:
Use of anaerobic cell respiration in yeasts to produce ethanol and carbon dioxide in baking

22. Anaerobic cell respiration demo
Materials
Yeast
Balloons
Water bottles
Sugar

23. Notebook Check & Study Guide
Biozone/ Notebook Check/ Test on FRIDAY