Energy in a Cell Cellular Respiration. Cellular respiration: process where mitochondria break down food molecules to produce ATP. (energy)

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    03-Jan-2016

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Energy in a CellCellular RespirationCellular RespirationCellular respiration: process where mitochondria break down food molecules to produce ATP. (energy)Cellular RespirationThree stages in cellular respiration: glycolysis, citric acid cycle, and electron transport chain.Cellular RespirationMitochondria is called the powerhouse of the cell because it is the site of cellular respiration.Cellular RespirationMore work a cell does, the more mitochondria it has.Cellular RespirationGlycolysis: first stage of cellular respiration.Cellular RespirationTakes place in the cytoplasm of the cell.Cellular RespirationOne C6H12O6 (glucose) is broken down into 2 pyruvic acid molecules. (a 3 C molecule)Cellular RespirationFor every glucose molecule broken down, 2 ATP molecules are produced.Cellular RespirationNext, the pyruvic acid moves into the mitochondria.Cellular RespirationCitric acid cycle or Krebs cycle : Pyruvic acid is broken down in a series of reactions to produce 2 CO2 and 1 ATP and electrons are passed on to the electron transport chain.Cellular RespirationElectron transport chain: series of proteins where electrons are passed. Cellular RespirationEnergy is released as electrons are passed from one molecule to the next.Cellular RespirationThe released energy is used to make ATP.Overall:For every glucose that enters cellular respiration 36 ATP are produced.Cellular RespirationCellular respiration can be classified as aerobic: cellular respiration occurs in the presence of O2.Cellular RespirationMost efficient form of respiration.Cellular RespirationKrebs cycle is aerobic respiration.Cellular RespirationCellular respiration can also be classified as anaerobic: respiration that proceeds in the absence of O2.Cellular RespirationGlycolysis is anaerobic respiration.Cellular RespirationNot as efficient as aerobic. Only 2 ATP formed.Cellular RespirationIn the absence of O2, pyruvic acid backs up and is eliminated 2 ways:Cellular RespirationIn you and me, pyruvic acid is converted to lactic acid and builds up in the muscles.Cellular RespirationIn yeast, pyruvic acid converted to CO2 and ethyl alcohol. This makes bread rise.Cellular RespirationAnaerobic respiration is also called fermentation.Cellular RespirationWhich molecule has the most stored energy: fat or carbohydrate?Cellular RespirationFat it has available energy for 51 ATP.

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