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Catabolic reactions give out energy. They are exergonic. In a catabolic reaction large molecules are broken down into smaller ones. For example, the reverse of the condensation reactions described above, i.e. hydrolysis reactions, are catabolic.
One of the most. important catabolic reactions of bacteria is fermentation, which is coupled with glycolysis, metabolic reactions through which the cells partially breakdown carbohydrates and obtain energy. In eukaryotic cells, fermentation follows glycolys is when there is a deficiency in oxygen, and this.