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Cellular Respiration: Harvesting Energy from Organic Compounds for ATP Production

Cellular respiration is the process by which cells produce ATP from breaking down organic compounds through glycolysis, Kreb's cycle, and electron transport. In the absence of oxygen, fermentation occurs, leading to lactic acid or alcoholic fermentation. Learn about glycolysis, fermentation pathways, energy yield, and more in this informative chapter on cellular respiration. Discover the efficiency and importance of anaerobic pathways in early evolution. Test your knowledge with review questions at the end of the section.

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Cellular Respiration: Harvesting Energy from Organic Compounds for ATP Production

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  1. 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. 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

  4. 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.

  5. 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!

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

  7. Section 7-1 Review • 1. DefineCellular 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?

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