An overview: Harvesting energy from glucose

Both eukaryotic and prokaryotic cells can harvest energy from glucose using different combinations of the following metabolic pathways:

The five pathways shown in Figure 9.4 occur in different locations in the cell (Table 9.1).

table 9.1 Cellular Locations for Major Energy Pathways in Eukaryotes and Prokaryotes
Eukaryotes Prokaryotes
In cytoplasm In cytoplasm
Glycolysis Glycolysis
Fermentation Fermentation
Citric acid cycle
Inside mitochondrion On cell membrane
Matrix Pyruvate oxidation
Citric acid cycle Respiratory chain
Pyruvate oxidation
Inner membrane
Respiratory chain

Activity 9.2 Energy Pathways in Cells

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