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8.2 Cell Respiration

Understandings:
  • Cell respiration involves the oxidation and reduction of electron carriers
  • Phosphorylation of molecules makes them less stable
  • In glycolysis, glucose is converted to pyruvate in the cytoplasm
  • Glycolysis gives a small net gain of ATP without the use of oxygen
  • In aerobic cell respiration pyruvate is decarboxylated and oxidized, and converted into acetyl compound and attached to coenzyme A to form acetyl coenzyme A in the link reaction.
  • In the Krebs cycle, the oxidation of acetyl groups is coupled to the reduction of hydrogen carriers, liberating carbon dioxide.
  • Energy released by oxidation reactions is carried to the cristae of the mitochondria by reduced NAD and FAD.
  • Transfer of the electrons between carriers in the electron transport chain in the membrane of the cristae is coupled to proton pumping.
  • In chemiosmosis protons diffuse through ATP synthase to generate ATP.
  • Oxygen is needed to bind with the free protons to maintain the hydrogen gradient, resulting in the formation of water
  • The structure of the mitochondrion is adapted to the function it performs
Applications
  • Electron tomography used to produce images of active mitochondria.
Skills
  • Analysis of diagrams of the pathways of aerobic respiration to decide where decarboxylation and oxidation reactions occur.
  • Annotations of a diagram of mitochondrion to indicate the adaptations to its function.
Nature of Science
  • Paradigm shift-chemiosmotic theory led to a paradigm shift in the field of bioenergetics.
Powerpoints
glycolysis.pdf
File Size: 2570 kb
File Type: pdf
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Homeworks
aerobic_respiration_.pdf
File Size: 3142 kb
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Respiration Drawings
Helpful Links, articles, and videos
Virtual Respiration 
https://docs.google.com/document/d/12d1bGXTLsLE9CD0SZDDjZiHBbcbMdQYktIAM3aeMWzM/edit
Review
aerobic_respiration_2017.pptx
File Size: 4917 kb
File Type: pptx
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Practice Questions
8.2_practice.pdf
File Size: 229 kb
File Type: pdf
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