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Glycolysis

Glycolysis. Campbell Biology 9.2. Background. Glycolysis = ( “ splitting of sugar ” ) breaks down glucose into two molecules of pyruvate. Glycolysis occurs in the cytoplasm. . Two Main Parts. Energy investment phase Energy payoff phase. 1. 2. Figure 9.9a. Investment Phase Part 1.

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Glycolysis

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  1. Glycolysis Campbell Biology 9.2

  2. Background • Glycolysis = (“splitting of sugar”) breaks down glucose into two molecules of pyruvate

  3. Glycolysis occurs in the cytoplasm.

  4. Two Main Parts • Energy investment phase • Energy payoff phase

  5. 1 2 Figure 9.9a Investment Phase Part 1 Glycolysis: Energy Investment Phase ATP Glucose Fructose 6-phosphate Glucose 6-phosphate ADP Phosphogluco-isomerase Hexokinase

  6. Investment Phase Part 2 3 4 5 Figure 9.9b Glycolysis: Energy Investment Phase ATP Fructose 1,6-bisphosphate Fructose 6-phosphate ADP Phospho-fructokinase Aldolase Dihydroxyacetonephosphate Glyceraldehyde3-phosphate Tostep 6 Isomerase

  7. 6 7 Figure 9.9c Glycolysis: Energy Payoff Phase 2 ATP 2 NADH 2 ADP +2 H 2 2 NAD 2 Phospho-glycerokinase Triosephosphatedehydrogenase 2 P i 3-Phospho-glycerate 1,3-Bisphospho-glycerate

  8. 10 9 8 Figure 9.9d Glycolysis: Energy Payoff Phase 2 ATP 2 H2O 2 ADP 2 2 2 2 Phospho-glyceromutase Pyruvatekinase Enolase Phosphoenol-pyruvate (PEP) 3-Phospho-glycerate 2-Phospho-glycerate Pyruvate

  9. Anaerobic • Glycolysis occurs whether or not O2 is present

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