1. End Show Slide 1 of 39 9-1 Chemical Pathways Fermentation Do Now: 1.Collect notes at front of room 2.Write down homework assignment 3.Answer these questions: Can cellular respiration occur if oxygen is NOT present? Can you still make ATP? Copyright Pearson Prentice Hall

2. End Show Slide 2 of 39 9-1 Chemical Pathways Copyright Pearson Prentice Hall Fermentation Fermentation is…. When oxygen is not present, glycolysis is followed by a different pathway. The combined process of this pathway and glycolysis is called fermentation. Glycolysis + no oxygen present = fermentation

3. End Show Slide 3 of 39 9-1 Chemical Pathways Copyright Pearson Prentice Hall Fermentation Fermentation releases energy from food molecules by producing ATP without oxygen Fermentation allows for short term energy production in the absence of oxygen.

4. End Show Slide 4 of 39 9-1 Chemical Pathways Copyright Pearson Prentice Hall Fermentation During fermentation, cells allow glycolysis to continue producing a steady supply of ATP. Fermentation does not require oxygen—it is an anaerobic process.

5. End Show 9-1 Chemical Pathways Slide 5 of 39 Copyright Pearson Prentice Hall Fermentation What are the two main types of fermentation?

6. End Show Slide 6 of 39 9-1 Chemical Pathways Copyright Pearson Prentice Hall Fermentation Alcoholic Fermentation Yeasts and a few other microorganisms use alcoholic fermentation Forming ethyl alcohol and carbon dioxide as wastes. The equation for alcoholic fermentation after glycolysis is: pyruvic acid → alcohol + CO 2 (ex: production of bread)

7. End Show Slide 7 of 39 9-1 Chemical Pathways Copyright Pearson Prentice Hall Fermentation Lactic Acid Fermentation In many cells, pyruvic acid that accumulates as a result of glycolysis can be converted to lactic acid. This type of fermentation is called lactic acid fermentation. Ex: your muscles or bacteria (how we get yogurt)

8. End Show Slide 8 of 39 9-1 Chemical Pathways Overview of aerobic and anaerobic Copyright Pearson Prentice Hall

9. End Show Slide 9 of 37 Copyright Pearson Prentice Hall 9-2 To generate energy over long periods, the body must use a.stored ATP. b.lactic acid fermentation. c.cellular respiration. d.glycolysis.

10. End Show Slide 10 of 37 Copyright Pearson Prentice Hall 9-2 Which statement correctly describes photosynthesis and cellular respiration? a.Photosynthesis releases energy, while cellular respiration stores energy. b.Photosynthesis and cellular respiration use the same raw materials. c.Cellular respiration releases energy, while photosynthesis stores energy. d.Cellular respiration and photosynthesis produce the same products.

11. End Show Slide 11 of 39 Copyright Pearson Prentice Hall 9-1 Fermentation releases energy from food molecules in the absence of a.oxygen. b.glucose. c.NADH. d.alcohol.

12. End Show Slide 12 of 39 Copyright Pearson Prentice Hall 9-1 The first step in fermentation is always a.lactic acid production. b.the Krebs cycle. c.glycolysis. d.alcohol production.