Galactozymase considered as an adaptive enzyme

Abstract
In Saccharomyces cerevisiae galactozymase is an adaptive enzyme. Adaptation occurs in aqueous solutions of galactose without cell multiplication and is therefore not a result of natural selection but a response of the cell to its chemical environment. So far adaptation has not been obtained in sterile cultures. The activity of both glucozymase and galactozymase is independent of cell viability. Adapted cells lose galactozymase after fermenting glucose and regain it in the presence of galactose.

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