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ENERGY IN CELLS

ENERGY IN CELLS. Chapter 3-3. METABOLISM. Definition: The total of all chemical activities of an organism that enables it to stay alive, grow and reproduce Living things are divided into two groups based on how they obtain food energy. Producers make their own food.

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ENERGY IN CELLS

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  1. ENERGYIN CELLS Chapter 3-3

  2. METABOLISM • Definition: The total of all chemical activities of an organism that enables it to stay alive, grow and reproduce • Living things are divided into two groups based on how they obtain food energy. • Producers make their own food. • Consumers can’t make their own food.

  3. Photosynthesis6CO2 + 6H2O + Light Energy C6H12O6 + 6O2 http://www.pbs.org/wgbh/nova/methuselah/photosynthesis.html • Light energy is used, by producers, to make sugar (glucose) from CO2 and H2O. • O2 is given off as “waste”. • Chlorophyll, located in the chloroplasts, captures light energy. • Producers: • Use some sugars • Store others as carbohydrates and lipids

  4. RespirationC6H12O6 + 6O2 6CO2 + 6H2O + Energy (ATP) • Both producers and consumers break down sugar (glucose) in their cells. • CO2 is given off as “waste”. • This process is called Cellular Respiration. • This takes place in the mitochondria with the help of oxygen (O2).

  5. COMPARE Photosynthesis6CO2 + 6H2O + Light Energy C6H12O6 + 6O2 RespirationC6H12O6 + 6O2 6CO2 + 6H2O + Energy (ATP)

  6. Fermentation • Sometimes, when oxygen levels are low, glucose can be broken down to produce small amounts of energy. • An organic compound called lactic acid is formed. Alcohol may also be a byproduct. • This process takes place in the cytoplasm.

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