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Cellular Respiration and Fermentation Plant Biology 1.

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Presentation on theme: "Cellular Respiration and Fermentation Plant Biology 1."— Presentation transcript:

1 Cellular Respiration and Fermentation Plant Biology 1

2 Respiration and Fermentation Process of converting glucose to a useable form of energy Process of converting glucose to a useable form of energy Respiration uses Oxygen and is very efficient Respiration uses Oxygen and is very efficient Fermentation does not need Oxygen but is very inefficient Fermentation does not need Oxygen but is very inefficient

3 ATP Adenosine Tri-phosphate Adenosine Tri-phosphate A compound that powers the cell A compound that powers the cell All cell parts need ATP to work properly All cell parts need ATP to work properly Without ATP, the cell dies. Without ATP, the cell dies.

4 ATP So where can we get ATP? Glycolysis, Cell respiration or fermentation

5 Glycolysis Cells cannot break down large compounds Cells cannot break down large compounds Glucose must be changed so the cell can use it. Glucose must be changed so the cell can use it. Through a series of chemical reactions, glucose is changed to pyruvic acid Through a series of chemical reactions, glucose is changed to pyruvic acid During this process, 6 molecules of ATP are produced (8 are produced, but 2 are used up) During this process, 6 molecules of ATP are produced (8 are produced, but 2 are used up)

6 Pyruvic acid Energy compound produced at the end of glycolysis Energy compound produced at the end of glycolysis

7 Glucose Pyruvic Acid 8 ATPs produced Glycolysis 2 ATPs used

8 Respiration (an aerobic process) Process of converting pyruvic acid to ATP in the presence of oxygen Process of converting pyruvic acid to ATP in the presence of oxygen One pyruvic acid molecule can produce 30 molecules of ATP One pyruvic acid molecule can produce 30 molecules of ATP By-product of respiration is CO 2 + H 2 0 By-product of respiration is CO 2 + H 2 0 Takes places inside each cell, in the mitochondria (organelle) Takes places inside each cell, in the mitochondria (organelle)

9 C 6 H 12 O 6 + 6O 2 = 6CO 2 +6 H 2 O This reaction produces 30 ATPs! Respiration

10 Glucose Pyruvic Acid 8 ATPs produced Glycolysis Respiration CO 2 and H 2 O 30 ATPs produced 2 ATPs used

11 What if there is no, or not enough oxygen? Fermentation

12 Fermentation (an anaerobic process) Process of producing some ATP without oxygen present Process of producing some ATP without oxygen present Much less efficient Much less efficient Only 2 ATPs are produced from each glucose molecule Only 2 ATPs are produced from each glucose molecule All cells are capable of fermentation All cells are capable of fermentation Two types Two types Lactic Acid fermentation Lactic Acid fermentation Alcoholic fermentation Alcoholic fermentation

13 Lactic Acid Fermentation Feeling the burn! Feeling the burn! When a cell runs out of oxygen, it makes ATP by repeating the glycolysis process. When a cell runs out of oxygen, it makes ATP by repeating the glycolysis process. Fermentation replaces a special compound lost during glycolysis Fermentation replaces a special compound lost during glycolysis Fermentation does not produce ATP, but merely allows the cell to go through the glycolysis process repeatedly. Fermentation does not produce ATP, but merely allows the cell to go through the glycolysis process repeatedly.

14 Lactic Acid fermentation Fermentation uses sugar much faster than respiration Fermentation uses sugar much faster than respiration This is why exercise is better if your cells are functioning in this mode (anaerobic). This is why exercise is better if your cells are functioning in this mode (anaerobic). Lactic acid and carbon dioxide are the by products of fermentation. If you produce them, your body must get rid of them quickly, or they can cause damage to your cells. Lactic acid and carbon dioxide are the by products of fermentation. If you produce them, your body must get rid of them quickly, or they can cause damage to your cells.

15 Alcoholic Fermentation Similar to lactic acid fermentation, but the by-product is ethyl alcohol, instead of lactic acid, and carbon dioxide Similar to lactic acid fermentation, but the by-product is ethyl alcohol, instead of lactic acid, and carbon dioxide The carbon dioxide produces the air spaces in bread, and the ethyl is the toxin that impairs brain function when consumed. The carbon dioxide produces the air spaces in bread, and the ethyl is the toxin that impairs brain function when consumed.

16 Glucose Pyruvic Acid 8 ATPs produced Glycolysis Respiration CO 2 and H 2 O 30 ATPs produced 2 ATPs used Fermentation Ethyl alcohol or lactic acid and CO 2 2 ATPs produced Is oxygen present? YesNo

17 Something to think about What is the advantage of aerobic respiration vs anaerobic? What is the advantage of aerobic respiration vs anaerobic? Why wouldnt all cells just do aerobic? Why wouldnt all cells just do aerobic? In what situations would anaerobic be better? In what situations would anaerobic be better?


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