1. Begins with Glycolysis
Cellular Respiration
Chapter 7-1
Organic compounds are broken down to release energy, as in ATP!
Begins with Glycolysis
If oxygen = aerobic respiration
1. Kreb's cycle
2. Electron transport
If no oxygen = fermentation
- lactic acid
- alcoholic

2. Harvesting Chemical Energy
7-1 Glycolysis and Fermentation
Harvesting Chemical Energy
Cellular respiration is a process in which cells make ATP by breaking down organic compounds (like those made by Photosynthesis).
Glycolysis: a biochemical pathway, which yields a small amount of ATP.
The products of glycolysis can then go one of two ways.

3. Use your textbook, pg. 128 to fill in this Glycolysis diagram.
Briefly list steps: 1. 2. 3. 4.
glycolysis

5. (Anaerobic Pathway - in the absence of oxygen)
Fermentation
(Anaerobic Pathway - in the absence of oxygen)
2 types
Lactic Acid Fermentation: an enzyme converts pyruvic acid into a 3-carbon compound, lactic acid.

6. Alcoholic Fermentation: pyruvic acid is converted into ethyl alcohol
Alcoholic Fermentation: pyruvic acid is converted into ethyl alcohol. Pathway has 2 steps. Note: A CO2 molecule is removed in the first step; think yeast cells and bread baking!

7. Energy Yield How efficient are anaerobic pathways? Not very!
Pathway evolved early, common for bacteria and single-celled organisms.
anaerobic respiration

9. Section 7-1 Review 1. Define Cellular Respiration.
2. What six-carbon molecule begins glycolysis, an what three-carbon molecules are produced at the end of glycolysis?
3. For each six-carbon molecule that begins glycolysis, how many ATP molecules are used and how many ATP molecules are produced?
4. What condition must exist in a cell for the cell to engage in fermentation?
5. How efficient is glycolysis?