A strictly fermentative bacterium produces energy by GLYCOLYSIS only.
GLYCOLYSIS:
- Glycolysis is the first stage of cellular respiration in the cells of living organisms in which glucose is broken down into pyruvate and 2 ATP molecules.
- Glycolysis occurs in the cytoplasm of the cell and does not require oxygen to occur. This accounts for the reason every living organism can undergo glycolysis.
- In the presence of oxygen, glycolysis is proceeded by Krebs cycle and electron transport chain. However, in the absence of oxygen, glycolysis is proceeded by a process called fermentation.
- Fermentation is an anaerobic process (without oxygen) and hence, organisms like bacteria that undergo them produce their energy by glycolysis.
Therefore, a strictly fermentative bacterium produces energy by glycolysis only.
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