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Cellular Catabolism Glycolysis

Cellular Catabolism Glycolysis. Packet #26 Chapter #9. Introduction. Glycolysis is a stage common to all organisms. The chain of reactions, that make up glycolysis , convert each molecule of glucose into smaller molecules. Pyruvate

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Cellular Catabolism Glycolysis

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  1. Cellular CatabolismGlycolysis Packet #26 Chapter #9

  2. Introduction • Glycolysis is a stage common to all organisms. • The chain of reactions, that make up glycolysis, convert each molecule of glucose into smaller molecules. • Pyruvate • Although it is not necessary to know all of the intermediate compounds/enzymes, but an appreciation for the major features is required.

  3. Introduction II • Glycolysis is derived from the Greek glykos, meaning sugar, and lysis, meaning splitting. • Glycolysis is the chain of reactions that convert each molecule of glucose* into smaller pyruvate molecules. • During the chain of reactions, used in the making of pyruvate, two important molecules are produced. • ATP • NADH

  4. Production of ATP During Glycolysis • Glycolysis produces ATP without the involvement of molecular oxygen. • The production of ATP, without the use of oxygen, is called substrate level phosphorylation. • During glycolysis, substrate level phosphorylation allows the net production of 2 ATP’s. • Four ATP’s are produced while two ATP’s are used. • Yielding two net ATP’s

  5. Substrate Level Phosphorylation • An enzyme, normally a protein kinase, removes a phosphate from the substrate and adds it to ADP to form ATP.

  6. Production of NADH • During the production of sugar intermediates, oxidation occurs when NAD+ removes electrons, via the H+ found on the original sugar (glucose) molecule, to make NADH. • During glycolysis, two NADH’s are produced per glucose molecule.

  7. End Product of GlycolysisPyruvate • At the end of the series of reactions, the production of the three carbon molecule,pyruvate, is complete. • Two pyruvates per glucose molecule. • Pyruvate, the three carbon product resulting form the splitting of sugar, passes from the cytosol to the mitochondria where the molecule is converted into CO2 plus an acetyl group (contains two carbons—ACoA). • This occurs immediately following the ten steps of glycolysis. • Also formed is one NADH molecule. (per pyruvate)

  8. Immediately Following Glycolysis • Pyruvate (3C) is converted into an acetyl group (2C). • Acetyl group (2C) attaches to coenzyme A (CoA) to form acetyl CoA (ACoA).

  9. Review • Glycolysis is a series of 10 steps that occurs inside the cytosol of the cell. • Glucose (6C) is split into two parts that ultimately result in the production of two pyruvates (3C. • 2 net ATP’s are produced per glucose molecule. • 2 NADH’s are produced per glucose molecule. • Immediately following glycolysis, each pyruvate (3C) is used to produce ACoA (2C) and one CO2.

  10. Deeper Insight I • Steps #1 – 3 is the energy investment phase

  11. Deeper Insight II • Steps #4 – 5 is the cleavage of the six-carbon molecule to two three carbon sugars. • Glyceraldehyde 3-phosphate

  12. Deeper Insight III • Steps #5 – 10 • The energy generation phase • End product be pyruvate.

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