Download - Energy in a Cell
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Energy in a CellCellular
Respiration
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Cellular Respiration•Cellular
respiration: process where mitochondria break down food molecules to produce ATP. (energy)
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Cellular Respiration•Three stages in
cellular respiration: glycolysis, citric acid cycle, and electron transport chain.
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Cellular Respiration•Mitochondria is
called the powerhouse of the cell because it is the site of cellular respiration.
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Cellular Respiration•More work a
cell does, the more mitochondria it has.
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Cellular Respiration•Glycolysis: first
stage of cellular respiration.
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Cellular Respiration•Takes place in
the cytoplasm of the cell.
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Cellular Respiration
•One C6H12O6
(glucose) is broken down into 2 pyruvic acid molecules. (a 3 C molecule)
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Cellular Respiration•For every
glucose molecule broken down, 2 ATP molecules are produced.
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Cellular Respiration•Next, the
pyruvic acid moves into the mitochondria.
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Cellular Respiration•Citric acid cycle or
Kreb’s 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.
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Cellular Respiration•Electron transport
chain: series of proteins where electrons are passed.
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Cellular Respiration•Energy is released
as electrons are passed from one molecule to the next.
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Cellular Respiration•The released
energy is used to make ATP.
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Overall:
•For every glucose that enters cellular respiration 36 ATP are produced.
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Cellular Respiration•Cellular
respiration can be classified as aerobic: cellular respiration occurs in the presence of O2.
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Cellular Respiration•Most efficient
form of respiration.
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Cellular Respiration•Krebs cycle is
aerobic respiration.
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Cellular Respiration•Cellular
respiration can also be classified as anaerobic: respiration that proceeds in the absence of O2.
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Cellular Respiration•Glycolysis is
anaerobic respiration.
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Cellular Respiration•Not as efficient as
aerobic. Only 2 ATP formed.
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Cellular Respiration• In the absence of
O2, pyruvic acid backs up and is eliminated 2 ways:
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Cellular Respiration1.In you and me,
pyruvic acid is converted to lactic acid and builds up in the muscles.
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Cellular Respiration2.In yeast, pyruvic
acid converted to CO2 and ethyl alcohol. This makes bread rise.
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Cellular Respiration•Anaerobic
respiration is also called fermentation.
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Cellular Respiration•Which molecule
has the most stored energy: fat or carbohydrate?
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Cellular Respiration•Fat – it has
available energy for 51 ATP.