Topic 8.2: Cell Respiration
- Energy is converted to a usable form in cell respiration
Nature of science:
- Paradigm shift—the chemiosmotic theory led to a paradigm shift in the field of bioenergetics. (2.3)
8.2 U 1 Cell respiration involves the oxidation and reduction of electron carriers.
8.2 U 2 Phosphorylation of molecules makes them less stable
8.2 U 3 In glycolysis, glucose is converted to pyruvate in the cytoplasm.
8.2 U 4 Glycolysis gives a small net gain of ATP without the use of oxygen.
8.2 U 5 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.
8.2 U 6 In the Krebs cycle, the oxidation of acetyl groups is coupled to the reduction of hydrogen carriers, liberating carbon dioxide.
8.2 U 7 Energy released by oxidation reactions is carried to the cristae of the mitochondria by reduced NAD and FAD.
8.2 U 8 Transfer of electrons between carriers in the electron transport chain in the membrane of the cristae is coupled to proton pumping.
8.2 U 9 Oxygen is the final electron acceptor.
8.2 U 10 In chemiosmosis protons diffuse through ATP synthase to generate ATP.
8.2 U 11 Oxygen is needed to bind with the free protons to maintain the hydrogen gradient, resulting in the formation of water.
8.2 U 12 The structure of the mitochondrion is adapted to the function it performs.
8.2 A 1 Electron tomography used to produce images of active mitochondria
8.2 S 1 Analysis of diagrams of the pathways of aerobic respiration to deduce where decarboxylation and oxidation reactions occur.
8.2 S 2 Annotation of a diagram of a mitochondrion to indicate the adaptations to its function.
In The News
In The News
- Peter Mitchell’s chemiosmotic theory encountered years of opposition before it was finally accepted. For what reasons does falsification not always result in an immediate acceptance of new theories or a paradigm shift?