8.3 Cellular Respiraon Day 2 - mrsshior.weebly.com€¦ · 8.3 Cellular Respiraon Day 2 Krebs Cycle...
Transcript of 8.3 Cellular Respiraon Day 2 - mrsshior.weebly.com€¦ · 8.3 Cellular Respiraon Day 2 Krebs Cycle...
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8.3CellularRespira/onDay2
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Krebs CycleKrebs cycle- The reactions that break pyruvate into carbon dioxide !!also know as:!
citric acid cycle because citric acid is the first compound formed !tricarboxylic acid (TCA) cycle!
!
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Steps of the Krebs cycle• pyruvate reacts with
coenzyme A (CoA) to form acetyl CoA.!!
• Acetyl CoA moves into the mitochondria.!!
• Acetyl CoA combines with a 4-carbon compound to form citric acid.!
!
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Citric acid broken down creating: !• two CO2 !• one ATP!• three NADH!• one FADH2.!!
Acetyl CoA and citric acid are generated and the cycle continues. !!
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Electron Transport Chain
-aerobic respiration (needs O2)!-most of the ATP is made. !!
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Electron Transport ChainNADH and FADH2 from the Krebs cycle power the ETC, moving H+ molecules.!!ATP Synthase is powered by the H+ to convert ADP to ATP.!!Oxygen is the final electron acceptor- the protons and electrons are added and form water.!
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Prokaryotic cellular respiration!prokaryotes do not have mitochondria, so they use the plasma membrane for electron transport. !!
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Anaerobic RespirationWhen oxygen is unavailable, cells cannot used aerobic respiration (Krebs cycle and electron transport).!!
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Fermentation- anaerobic respiration (after glycolysis)!!Fermentation occurs in the cytoplasm, and produces NAD+ and ATP. !(Glycolysis will stop if there isn’t enough NAD+)!
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Lactic acid fermentationEnzymes convert pyruvate into lactic acid.!!• Skeletal muscles produce
lactic acid when there isn’t enough oxygen, such as during exercise. !
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Alcohol fermentation Converts pyruvate into ethyl alcohol and carbon dioxide!!• Occurs in yeast and
some bacteria!!
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Photosynthesis and Cellular Respiration